Wes, you don't state what kind of colitis you have. Anyway, last month you posted on your birthday that you have lost a lot of size because of injuries, etc. You sounded very down. Two weeks later you report that you have colitis. This disease is related to stress, anxiety, depression, etc. That is why scans won't find the cause. Also, you need to make sure you get enough iron because you can lose plenty through the disease. Dehydration is also another problem. Colitis is a kind of ulcer in the colon or other parts of the digestive tract. As a former bodybuilder it won't be easy to let go of those hard earned muscles you used to have. Those days are now gone for most older guys. Maintaining a tranquil mind like Bob Hoffman recommended is easier said than done. Good luck.