Three months is early. While everyone is different, and so is the amount of radiation, and location of it, and the BOT is integral for swallowing, and was heavily radiated. I couldn't eat anything for at least 7 weeks post treatment, and that was maybe a teaspoon of broth, cream of wheat. It was many more months before I can barely say I ate a meal. Radiation has short term toxicities, that resolve less than three months, and long term toxicities, more than 3 months, some which can take months, years, decades to resolve, happen or not at all. Chemo effects usually start several days after infusion, and resolve after treatment, but some can be long term, depending on the chemo, dosage amount, frequency, and infusion rate, like hearing, neuropathy, kidneys, vision. People often have swelling, dry mouth, difficulty in the morning for many reasons. I sleep on an incline bed, some use humidifiers to help with dryness, and other things to help.
Good luck.