MMS has been successful with colitis. Due to your situation I sure wouldn't take very much. Not much is usually needed.
Maybe take it once a day so your body can deal with it easier. And start out with one drop or less. Any slight signs of discomfort stop taking it right away and re- evaluate. Work your way up to 5 drops at the most. Generally Miracle-Mineral-Supplement is suppose to be good for the liver but yours is very delicate.
After your done try Iodine supplementation in a similar careful way.