It's not a fun situation, but your health is the most important thing. Blame the disease, not your friends, and be clear that it will be easier on everyone if you're on your own. Help them find a new roommate, hopefully the friendships will stay, even if you're not there.
Pretty much since going gluten-free, I've lived on my own mostly for the piece of mind of controlling my own kitchen. Handling rent on your own is not an easy thing to do in this city, but it's been worth it. Now my gluten-eating BF and I are living together, but the kitchen is my domain, and he's been super super careful. No problems as of yet.
Unless your roommates/significant others/family are willing to truly commit to keeping you safe, then it's better to go it alone.
Good luck with the move!
Also, welcome to the forum!