Can't take these bowel pain's no more! HELP! [IBS]?

Alright so Ive been to a GI doctor and everything been tested for everything and more, they conclude my stomach is slightly inflamed and that I have IBS. Well Is there some other disease that can act like IBS but isn't? That might be treat able? I'm 17 and ive had bowel issues my whole life, but Now that I'm older it seems its gotten worse and sometimes better, its very bipolar! today, I took a bike ride because well, I need to go outside, IBS keeps me from doing that. with along much other things! about 1/4 the way home, I felt my bowels just horrible feeling, Idk what else to call it, but I Felt the "poop" inside me like almost move! it was horrible! It felt like air also was inside me, and was stretching me from the inside out! It was so painful when I got home, I threw up the water I'd had been drinking to keep hydrated! and some eggs from the morning. I cant take it no more! Every time I have an "attack" the thought of killing myself, because of it gets stronger! My mental thinking is, That I don't fear death because with this disease death seems much more pain free. and It's really that bad. I Just want it to go away! I'm only 17 and no one will hire me for a job because "I'm special needs" plus I can't work in food service because the smell of the food makes me sick for some reason as well. I'm not normal this disease has screwed up my life! my school life has always been lacking, but last year. I missed over 40 days of school! And I have friends, and a girlfriend [ love you :) ] But all my friends go to concerts, have a good time with their young lifes, and I'm stuck at home Suffering with boredom and Horrible pains!