My husband as a limited small cell lung cancer , between Jan. and Feb. of this year he received 30 Radiation treatments and he did have some mild issues with swallowing but only during the last 10 days of treatments . I can't remember the name of the liquid he took but it was a white creamy liquid ( prescription ) and it worked also help reduce acid. My husband also developed a cough and the doctor prescribe a low dose of codeine ( 15 mg ) similar to what you would get in a Tylenol 1 and it curbs the cough. The last 10 days were the most demanding and he was more tired. But a few weeks after radiation he was back to normal activities.
Take care and just take it on day at the time and sometimes 1 hour at the time :)