Talk to your doctor about getting on Zoloft. Look it up. It'll help all your symptoms. And you may have hypacondria. But yes Anxiety can make you feel that way...also take iron pills and b12
Everything you've written sounds like textbook anxiety, so I highly doubt you have any kind of disease. Personally, I would stay away from pot, energy drinks, lots of caffeine, etc. Exercise, get plenty of rest, eat healthy foods, etc and you'll be fine. If the anxiety symptoms continue, go see a psychologist/therapist. I wish you all the best!