Hypochondriac from anxiety? I read symptoms of certain things online (ie. Brain tumor, heart problems, etc) and "give" myself the issue right away.

Calm down. Rest assured that most of what you are worried about are very rare in 22 year olds. As others have suggested, read about what you are worried about and it should allay your concerns, and if not consult your doctor and get a referral to a psychiatrist or psychologist to help you with the anxieties.