Dr. Jennifer Daly in Carrigaline is good - she was a gp before going the alternative medicine route. You'll find her in the golden pages, but there is usually a longish waiting list unless you can take a cancellation.
I know its a medical question and I wouldn't normally ask but it was kind of a general question, I don't have a medical condition I was just more curious to see if I was allergic to any type of food!