Anxiety can cause all sorts of horrible effects; stomach, mental, hormonal problems. If you always feel really keyed up in social settings or 'non-safe' environments (like college or going to social functions where you are not comfortable), you may have a social anxiety disorder.
Any type of psychological disorder cannot be treated with a magic pill or overnight. Reason being is that many years of traumas (whether you realize you have been traumatized or not) build up until it changes your body chemistry, overall affecting your mental well-being.
If I were you, I'd look up social anxiety on the internet. They have self-tests that can judge whether you have a predisposition to a disorder. Or check out a book on social/anxiety/panic disorders. See if you have any of the symptoms. If so, you may wish to go to a psychiatrist. They can either dx you with a disorder or let you know if it's something physiological (like IBS or thyroid disorder).
If you do have anxiety, it can be treated. For anyone who has it and has neglected treatment, you do not have to live like this. There is a better, anxiety-free world.
Let us know what ya find out.