Is it base of tongue or oral tongue? It sounds to me like oral tongue based on the surgery... Rads and chemo is not fun but doable. Radiation doesn't hurt when it's being done but the effects are cumulative at some point -usually week 3-4 you will start to lose taste, experience mouth sores and begin have swallowing issues. (the severity is based on where they're aim the radiation). Some people are given a feeding tube, as all of this interferes with eating and nutrition - eat up now as you may lose appetite and the desire to eat for a bit. I would like to say quality of nutrition is as important as quantity. Pick up a good cream for your neck... Depending on your skin type - the more pale the worse it can be - you may blister, and burn, and peel. They will recommend creams. Pain meds should be asked for before things become really bad. Usually this is the 5-8 week mark - radiation ends at week 6 but it keeps working for a Few weeks after. Then slowly you should begin to feel better. You should have a hearing test and dentist appointment, they may pull any teeth they think you will have forever, and you should be fitted for flouride trays which you should use for the rest of your life or as long as you have teeth. This is because radiation cooks your salivary glands and you may never get a normal amount of saliva again. Saliva cleans your teeth and protects them, no saliva - very cavity prone and if you have to have a tooth pulled later it cn be a bad situation. (30-40) HBO dives to promote healing, and prevent possible osteo radiation necrosis of your jaw (caused by having a tooth pulled and radiation fall out) - not something you want to deal with.
Th mask may shock you and bother you if you are claustrophobic you may need meds to get through it. It is tight enough to keep you from moving, mesh (plastic) and it will lock your head and shoulders to the table.
Chemo is hit or miss - I had minimal nausea that's it, but I know people who threw up steadily for the whole time. Usually people fall somewhere in the middle. Try to keep swallowing if you can it will help you later, as you don't want to be on a tube for the rest if your life. Magic mouthwash will help if you do try to eat or drink your nutrition. It numbs you temporarily -
You will drool... Copious amounts - this will subside and then you'll be dry as the Sahara
I know this is all overwhelming but most of us here hav been through it and have come out the other side... Battered but okay. You'll get here too.
I'm sure I've missed things - others will be along to welcome you and add to it. Also they'll recommend a salt water, sodium bicarbonate, water mixture to rinse with. It helps heal your mouth. You can also flatten club soda and drink it lukewarm for the same effect. carry a bottle at all times...
Take care... sorry you hav to be here but there's lots of support.