Hey Jordan,
You don't know me from Adam's housecat, but I had to drop a message.
I was diagnosed with ulcerative colitis in 1997, after losing a ton of weight in a short time like you have. I have been through the ups and downs, the medications and the side effects which almost as bad as the disease itself, the good days, the bad days, and finally had to have surgery, which I sincerely hope you can avoid.
The best advice I can give you is to take it easy. Allow yourself to be slow. This disease can be beaten back until it's under control (my father, who also has UC, lived with long periods of remission until he finally had surgery). There are support groups on the 'Net which cater to younger people, try to find one that you like.
I wish you all the best,
Jennifer