In addition to what Cathy mentioned, I would say that you have outlined some really cool points to get started on. However, as you say you are just starting out, so, cool you pushed yourself through to write out what you wrote in your post, however, its important for us to understand where you're at in terms of your understanding of self-forgiveness. In terms of the points you mentioned above, I would break it down like this:
why is my stomach in knots? I have lived with this feeling in my stomach my whole life, in good times or in bad times. This sick feeling never goes away, driven by fear
I forgive myself for accepting and allowing myself to exist within and as the internal experience of 'my stomach in knots.'
This is a very basic sf statement that is kind of just addressing the general point, or the physically manifested experience that you are going through (that you are literally doing to yourself, which isn't necessary) which indicats an underlying point that you are participating within yourself, within your mind, such as thoughts, beliefs and perceptions such as these:
prior to any of my kids sporting events it would be so intense I can hardly breathe. The fear of them not doing well, not being good enough, making mistakes, letting the team down. These are all the feelings I feel, I could never do anything right, I could never be a good enough mom/wife
Only you can really reveal to yourself the underlying points that is causing the experience of 'stomach in knots,' and self-forgiveness will help you dig down to the source. So if it is the fears you mentioned above, then you would one by one forgive them:
I forgive myself that I have accepted and allowed myself to particiate within and as the fear of my children not doing well at sporting events.
Then you look at how you created that fear, by asking yourself, why do I fear my children not doing well at sporting events?
The answer could be something like:
I forgive myself that I have accepted and allowed myself to place expectations on the performance of my children during sporting events.
I forgive myself that I have accepted and allowed myself to judge the performance of my children at sporting events, within the desire for them to do well, instead of simply watching them enjoy themselves within and as their physical bodies.
I forgive myself that I have accepted and allowed myself to desire my children to do well at sporting events.
And then you keep listing/forgiving all the reasons why you desire your children to do well, and/or fear them not doing well.
Then because this is an energetic experience within you, and energy always works in polarity, you can forgive the polarity, as in- the polar opposite experience:
I forgive myself that I have accepted and allowed myself to fear the though of my children doing poorly at sporting events.
I forgive myself that I have accepted and allowed myself to fear how my children might experience themselves if they performed poorly at a sporting event, instead of realizing that I cannot be responsible for the internal experiences of my children because it is simply not possible, and I realize that I can only stand as a pillar of support for them, by taking steps to be/become stable within myself, and to lead as an example as someone who can stand within myself, regardless of whether or not I perform well or poorly in my life and world.
Then, you can also bring it back to yourself, because the whole experience is self-created:
I forgive myself that I have accepted and allowed myself to project myself on to my children, thus projecting my own fears of how I would feel if I performed poorly during a sporting event (or any similar event that you would practically actually participate within in your own life, that you are relating to your children's sporting event.
I forgive myself that I have accepted and allowed myself to place high expectations on myself, wherein I judge myself if I do not acheive them
I forgive myself that I have accepted and allowed myself to to fear how others would judge me if I performed poorly at an event.
I forgive myself that I have accepted and allowed myself to fear the judgment of others.
I forgive myself that I have accepted and allowed myself to judge myself.
I forgive myself that I have accepted and allowed myself to fear my own self-judgment.
I forgive myself that I have not accepted and allowed myself to accept myself unconditionally.
So, this is just to give you a jist of some of the applications of self-forgiveness statements. If you read them through, outloud would be best, and see if any of them hit on something, then you can try doing some self-forgiveness for yourself here on the forum. Remember: you are innocece as Life, and do not deserve to live in a constant state of having a stomach in knots, a sick feeling, or the experience of being driven by fear (which we basically all are). It is your responsibility to forgive yourself so as to not perpetuate this experience, for yourself, and also to not lead as an example to your children to live such an experience.
Or, if you're not ready, then search the Desteni material to learn more about self-forgiveness, how it works and the kind of 'mechanics' of it.
So, like I said- awesome that you pushed yourself to post/share yourself here, now it's up to you to continue to push yourself to uncover yourself and how you created this experience of yourself. If you're confused or would like links to particular points that you were unable to find on your own, just ask, and you will be supported.