I have this
I can't eat white carbs (bread, pasta) But now I think I can't have too much milk, or whole milk. So stick to soya or skimmed.
Go Docs, or try eliminate the usual things from your diet (white carbs/diary are usual suspects when it comes to problems)
There was a DIY allergy kit on groupon
a few weeks ago, you could see if it comes back round? But it doesnt sound like an allergy, more just an irritation.