Congrats of finishing yoru treatments! Radiation is still continuing to work for a few weeks so dont be surprised if you still feel kinda crappy for a while. After about week 3 you should slowly begin to feel a little better each day. Most fruits are too acidic to eat at this early recovery stage. Bland foods with a smoother texture will probably work best for at least the next few weeks. You main issue needs to be caloric intake with trying to eat as healthy as you can. Not easy but check out the shake recipe and food list below.
The thick gunky mucous last only about a month before it overnight turns into the dry mouth phase. You can always go see the ENT or oncologist to get suctioned out. Ask your doc for a prescription for a portable suction machine so it can be done at home.
Rinsing with seltzer water, using a waterpik on its lowest setting and continuing to rinse with baking soda, salt and 16 oz of warm water all will help as well. Some members have found relief with gargling with seltzer water.
Intake still must be your main focus. Every single day you need a minimum of 2500 calories and 48-64 oz of water. This needs to continue until at the minimum you hit the one year post rads mark. Nutrition is what will heal you and get you back on his feet. If you can push to take in more, even 3500 calories its not too much for this phase. The more you takes in the better you will feel. I used generic high protein whey powder I bought at Rite Aid or Walmart.
Here is a recipe for something I used to make and drink when I went thru treatments. The shake has anywhere from 1200-2000 calories depending on how you make it. The list of foods might help too, they mostly have a smoother texture and arent spicy which should be easier to tolerate.
Easy to Eat Food List (All measurements are estimates)
Giant High Calorie Choc-Peanut Butter Milkshake3 or 4 cups chocolate ice cream (regular/full fat type)
2 tablespoons peanut butter (smooth type)
2 tablespoons chocolate syrup
1 or 2 cups whole milk (can substitute half and half to add even more calories)
1 scoop carnation instant breakfast
1 scoop high protein whey powder (check with doc if this is ok)
Blend this extra long to make it very smooth and creamy so it goes down easier. If the shake is too thick, add more milk to thin it down to what works best for you.
Hang in there! Very soon you will be coming out of the tunnel.