Allergies

My throat has been acting up the last few days. Hard swallowing, sores on the roof of my mouth. I have always had allergy symptoms  around this time of year but I can't really tell if its allergies or not. Foods with. Tomatoe sauce seem to be particulary hard to get down recently- even though it has been going down pretty easy the last month or two. How does everyone else react to summer allergies right after radiation and chemo?