Have Had Very Swollen Taste Buds On Tongue. Vitamin Deficiency?

I have had very swollen taste buds all the way down the far back of. my tongue for about a year. not painful until i recently had a sinus headache that is gone now, some drainage. One year ago I was on flagyl and ever since then cannot get rid of these. My tongue now feels kinda sore off and on. Did go see my ENT and he said maybe a little yeast , and could be a vitamin deficinacy. Wanted to get another opinion, My dentist has seen these as well and he says its thrush that caused it, but my regular MD says no that there just inflammed. Please help, tired of trying to figure this out.