Karen,

I can't answer all of your questions, but I finished radiation on Jan. 25th. I still have trouble swallowing some things (pills)due to my throat not being healed totally yet. And both my tongue and throat are still sensitive to hot, cold and spicy.
My voice can get funny if I don't drink enough water when talking.
I don't know the answer about the ulcers on your tongue, if you don't trust your oncologist answers to these questions you might get a second opinion?

Take care and welcome to OCF.
Dinah