Are you from the UK? (Fortisip.)
I agree with TPN. It bypasses the gut entirely, so there shouldn't be an issue with obstructions while you're on it.
The only other suggestion I've got is one that is probably not feasible, but hell, I'm going to suggest it anyway: small bowel transplant. It's available in the UK. Seems to me you meet the requirements for intestinal failure: please look into it.
www.bts.org.uk/Member/Clinical/Small_Bowel.aspx