MD in US is an abbreviation for Medical Doctor.

The diet you choose can be anything, low in sugars and starchy carbs (you can have some in very small moderation).

Good choice of veggies of various colors, and some fruit like strawberries/blueberries for their antioxidants.

Watch the nightshades in case they are causing your burning.
Potatoes, tomatoes, peppers, eggplant. Avoid these for a month, and see if you have improvements.

Watch the wine, in case the sulfites are your trigger.

If these turn out to not be your trigger, then avoid gluten for 3 months and see if you improve.

MSG food additive is very difficult and should be avoided, as it causes pain in some people. It is very bad for PNers.

Why are you low in iron? Do you have low stomach acid? Acid is necessary to absorb iron, from food. Low acid means you cannot break up protein as well.

Instead of running, I'd do walks instead for now.