Letters to the Editor
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This is not a stage/phase you're going through
You need to see a psychiatrist and probably need counseling and medication. Your teen "angst" is severe, and it is not a stage you're going through.
You also don't mention any friends or family interaction -- deliberately absent in your description of your fake abdominal pain episode. There is an abnormal detachment from the real world in your narrative.
Either you're an older person writing a fake letter, or you are clinically depressed and also have some type of personality disorder. Assuming you are really 18 years old, it is imperative that you get medical AND psychiatric help.

