Eileen, I sure hope they can get both issues resolved for your husband. Thrush can really be miserable to deal with. I'm really surprised that the difulcan hasn't knocked it down after a month.
I know there are several other medications that are stronger still, and I'm sure they will find something that works.
The suction machine has been a God-send for many people. Hopefully it does the trick and let your husband get some food in.
It sounds like he's got just what he needs; a very strong advocate fighting on his behalf.
Best of luck
Wayne