Why is the roof of my mouth suddenly sore (strange pain) when I eat food?

I hadn't eaten much for two days and then today I got some french fries from McDonalds. I started to eat them and about 2 minutes later, the roof of my mouth felt inflammed! I would guess a food allergy but I eat fries all the time and that never happens! I waited about an hour and then ate a Yogplait strawberry... show more I hadn't eaten much for two days and then today I got some french fries from McDonalds. I started to eat them and about 2 minutes later, the roof of my mouth felt inflammed!

I would guess a food allergy but I eat fries all the time and that never happens! I waited about an hour and then ate a Yogplait strawberry yogurt and the same thing happened!!

Can anyone tell me possible causes for this? (and how to fix it!)

Some more about me:
I'm 19 and have no major health issues. I occasionally take ADHD medication to help me concentrate.
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