I'm sorry for your troubles Shivani. it sounds like the cancer has returned, reminiscent or just shrunk from what sounds like induction chemo, followed by Chemoradiation? I can't answer for everyone or in every situation, but most follow NCCN Guidelines. it does seem like surgery would be the next option, and the tumor was large at T4. Chemo isn't curative by itself, and reirridation may be too early, if less than 6 months. I've heard of Brachtherapy given right after Tx, as a boost dose, after external beam radiation like IMRT, if it was part of the treatment package, otherwise another course of radiation may be too early as mentioned. Maybe another opinion would help, and getting the hospital to deal with the pain, and eating issues.

If you have any further information it would be helpful for responses, but again, none of us are doctors, but have walked in many head and neck cancer patients shoes. Is your fathers oral tongue or base of tongue, oropharyngeal, which are different, treated somewhat differently.

Good luck.