Do you have a gluten or lactose intolerance? Why not do the diet with the meds and see how it goes? There are usually digestion issues with both of these conditions. I have not heard that mental problems are indicators too. Also any reduction in medication might make it hard to know if it is a problem or not.
Your doctor needs to know what you intend and why. It is always possible that he will reduce your medications because of the reactions. You will then have someone to monitor your condition.