There are SPOHNC, Support for People with Oral and Head and Neck Cancer, meetings in local chapters that meet once a month. In NYC they are at Mt. Sinai, NYU and Beth Israel, others are in Long Island, Upstate NY. The one I attend is facilitated by a Speech and Language Therapist, SLP, and is very helpful.
As far as creams, I only needed Aquaphor, then another time used Cetaphil, which was less greasy, as both were suggested. I also used liquid soaps, either Aveeno, Cetaphil or Dove liquid soap for sensitive skin.
https://www.spohnc.org/local_chapters.phpGood luck with treatment.