I just completed treatment for the very same diagnosis a little over three months ago. Surgery, chemo x 2 (Docetaxel), and photon radiation x 20 over 10days. (De-escalation regimen / DART trial)

Since my chemo was concurrent with radiation it's hard to discern what caused what, but I experienced just about what the team prepared me for. I reacted to each chemo infusion in the first 1-2 minutes and that was not fun. Towards the end of my treatment I experienced persistent nausea / queasiness for a couple weeks. The rest of my symptoms were more related to radiation : significant throat pain, mouth ulceration, fatigue, and dry mouth / ropey saliva.

The good news is that as unpleasant as it was, it was temporary and managed well with with Fentanyl patches and backup liquid oxy / lidocaine rinses. Not sure I directly answered your questions but I hope it helps. Good luck and focus on daily improvement. It will get better.