i'm coming on so late to your thread that you must be well by now.
i'm so sorry you're going thru all this.
i've had oral thrush before and i know how awful it is. the swishes will ease it very much.

what was all the wt gain from? i can't remember what surgery you had.
did you have steroids? sorry for my brain fart.

the only other thing i can think of for the N/V is a med. a rectal suppository. they work great. please don't let yourself run out of pain meds. it's harder to catch up to pain than stay on top of it. i'm sure your dr should understand.
you might try just a bit of honey in some hot tea.

i sure hope you feel better.