During and after my radiation treatments I found that Almond milk was the one thing I could swallow without having pain and was actually soothing. I recommended it to my brother-in-law who had gone through chemo & radiation and he also found it helpful. You may want to give it a try perhaps you too will find it soothing. It does take some time to recover and for each individual the time frame is different but you will get better so hang in there!
Best of Luck to you!