I know Kimber will answer you but I thought I'd tell you what I found out this week. I went to my G.I.(gastroenterologist) doc because I have alot of nausea and constipation and she is putting me on Zelnorm. I know someone else who has these problems and is on Zelnorm also.
MS can cause slow stomach emptying and nausea, constipation etc... I don't recall what all your tummy troubles were but have you seen a gastroenterologist about it?
Take care, I hope you have relief soon!