I'm so sorry you're this sick. Obstructions are scary not to mention very painful. On top of all that, you may be having withdrawal from prednisone. Changing from a high dose of prednisone to Entocort could still cause withdrawal and make you feel terrible. As for the left side situation. Your colon is sort of wrapped around the small intestine area, so you can have pain from the colon on the left, right or upper region, but you can have left-sided pain from the small intestine too. One thing would be to look at an anatomy pic and see what correlates.
With the eythema nodosum, it doesn't sound like things are under control.
48 yr. old. Ileocolitis. CD since early teens, misdx'd until age 36. Hemicolectomy-left side in 2001. Disease returned in 2003. Arthritis, episcleritis, chronic pain due to surgeries (nerve damage, adhesions) and disease. Recently dx'd scoliosis. History of endometriosis.