I have just finished week 2 of 5 weeks of radiation. I feel like I have swelling inside of my mouth on my cheeks. Anyone ever had this?

DX 2/10/09; Stage 1 SCC side of tongue; Partial Gloss; PEG in 3/3/09; 3 Cisplatin; 35 IMRT; PEG out 7/17/09; Eating via mouth and walking 3 miles/day 4 wks after treatment end. 50 pound weight loss; Clear PET 09/09 and 09/10