Are there any mistakes in these few sentences?

Could you tell me if there are any mistakes in these sentences?

This afternoon, I bought a bar of Camior chocolate from Isetan, because it's cheap and looked foreign (I want to say it looks like it's form western countries). I'm allergic to chocolate. My teeth are always painful while I am eating chocolate, but not this time. I was delighted. I must buy it again next time when I go there.

Great Thanks in Advance.