Been doing so well after treatment but ....

Week three and started getting a few mouth ulcers, i thought I had managed to escape all but an odd one, can I expect more, only just started eating and swallowing, will bonjella be any good, I am using a steroid based mouthwash 3 x daily

So far ive missed a lot of the side effects after my tosnsil radiotherapy, except the exhaustion, which caused me to collapse outside of boots, had a really sore tongue but thats getting better and my tongue muscle isnt as stiff, still cant open mouth fully but not a prob, 

But can I expect more ulcers, ihope not