Swallowing issues after radiotherapy

Hi,i have SCLC had 3 months of chemotherapy, then 15 sessions of radiotherapy. I have lymph nodes involvement on my oesophagus which was also treated with the radiotherapy. It's been 3 weeks now since treatment and i am struggling to eat and drink due to issues swallowing because of pain. Also coughing up copious amount of phlegm. Has anyone else had this,and how long did it last.I was hospitalised last week due to being dehydrated, but thing aren't improving, really scared I'm going to be left with this.