I'm pretty sure I have tennis elbow. That's a form of tendonitis. Of course, I haven't been to a doctor yet. And I haven't played tennis since 1970. Still, that's my self-diagnosis, and I'm sticking to it.
I provide a guide to self-diagnosis that starts at the top of your head and moves all the way down to the bottom of your feet. Finally, all hypochondriacs can have the ability to diagnose all of their visible life-threatening symptoms without the use of an Internet connection!