Should I look for medical help?

So I'm in love with a friend for three years and I never told him because I knew that I'm not what he likes. Because of that, I decide to get away, stop being social because I couldn't see him and since I'm very shy, I couldn't talk to anyone about my feelings. Now, he's flirting with my friend and I know she likes him for a while, and I feel so bad, so sad, so disappointed. To complete all that, recently I got the results of a few medical tests and it weren't good. I suffer depression, my GI tract is paralyzed and I might have lung cancer because that's what the results shows. So yeah I wanted to die before all this and know with these situations I don't even know what to do and what to think. I don't want to die after all the things I achieved, after getting into med school young, graduating college with honors, I just don't know what to do, I don't have anyone to talk to. So Should I look for medical help? :(