you have hypochondria, thats a very normal symptom of anxiety, stress, and especially OCD
(( the deifnition of hypochondira is a person who is constantly preoccupied iwth health, haveng unrelalalistic fears, and is not comferted by tests or docters. ))
the best thing to do for this is DONT look up aything medical related unless your told to by your docter, have a regular physical once a month to ease your mind, and relax.
thats the most important; you can try massage tehrapy, aromatherapy, herbs, or even meds if need be. just whatever it takes to relax you

let me enphasie; please try other methods of relaxing before trying meds
make sure you eat a balanced diet, and excersize, and try takeinga good multivitimin (that helps anxiety alot more than youd thing)
alot of peopel feel like you, your anything but alone <3