Some patients alternate between constipation and diarrhea. My approach to an MS patient with diarrhea is to rule out other causes of diarrhea, such as medications, side effects, irritable bowel syndrome, or other conditions in the colon. While some of your current medications may be implicated in diarrhea, spinal cord myelin loss from MS is a real possibility also. Myelin damage can also cause pain in the fingers occasionally. However, hand pain can also be caused by other conditions such as reflex sympathetic dystrophy, a very complex condition.
Symptoms can include pain as well as cold, warm, blue, white, and swollen hands.
Your neurologist will be able to give you a more complete explanation and outline treatment options. This diagnosis has two therapeutic implications. First, since you may still be having relapses you may be a candidate for Betaseron, Avonex, or Copaxone. The second treatment consideration is a short course of high dose intravenous steroids to try to reverse your symptoms. The steroid issues are complex and your neurologist is best at determining your possible benefit versus toxicity.