Welcome to the group. I'm sorry to hear about your troubles and I hope you stablize very soon. Thank goodnes you switched doctors, some can be very insensitive, and I think some take it as an insult if you ask for a specialist. Your health should alway come before their egos.
To some people who read my posts, they might think I sound like a broken record when I say - Have you tried using probiotics yet? Primal Defense has helped me a lot in getting stable. Can your recent cramping & D be caused by too much acacia? From what I've read from other posters, too much too soon might not be too good for you.
I didn't know Levsin was still available. I used to take it a few years ago, but then my doctor prescribed it to me 1 or 2 years ago and the pharmacy said it was discontinued.
Keep us posted on your progress and feel free to ask about anything.