Why not ask for the brand name Entocort? We had many members who have bad luck with the generic Entocort. Many had the same problems as you have and have had to either change to Pred or go back on the brand name Entocort.
And yes your GI should be telling you which meds to take. Entocort is not a maintenance med. It is as you know a steroid, and you really should not be using it to maintain your Crohns.
As for how you are feeling now, I would give it a couple of days as I suggested earlier, becuz it could be what you ate that got you this time. At least thats how it sounds to me. And for that I would stick with something like the Librax. If its the effects of maybe one of the fillers in Entocort or from eating that hamburger, no other Crohns meds are gonna fix that. You will have to change to the brand Entocort and go with a lighter diet for a few days.
As for what to eat, stick with soft/bland foods, things that are easy to chew and easy to digest. Good luck!