It can be a long haul if they think it is EC, which it sounds like it. Hang in there. :hug:
I'm treating my Becky right now for the same thing. It's two hopps forward and one hop back. It has been three weeks of treatment and she's just now starting to get feisty not wanting her medicine and starting to come out to visit us in the living room (their bedroom is right next door in my office).
I think in many ways it is harder on us caretakers than it is on the buns themselves. Give Cotton a kiss from me and a nose bonk from Becky.