I'm with Randy. I would call your doctor. My Mom had Short Bowel Syndrome, but not until she had had 3 resections, over the course of 30+ years. During the first one, in the mid 60's they just cut and cut and cut. I've tried to get her records to find out exactly how much bowel she had taken out, but I've never been able to get them. She had to supplement her diet with a specific fat so that she could absorb some nutrients. This was about 15 years ago, so things may have changed. As for the B12, you will need to have your level checked by blood work. It is a specific test. Not something that is done in the normal CBC. Your body does store B12, so if you have some reserves, you could go a long time before you actually need B12 shots, or you may already be depleted depending on how long and how severe your disease was. I went more than a decade before I had to start getting B12 shots.
CD 20 years officially, 30 unofficially. 3 resections '93, '95 '97
Managing with strict low residue diet, keeping symptoms to a minimum. All test show small amount of ulceration, still have occasional blockages. But still have a great time with my 2 daughters and husband!
Prednisone, 6MP,Prevacid, B12 shots, Bentyl, Xifaxan.....