Food is a very personal thing so you need to decide how strict you want to get.

Pretty much every doctor that practices functional medicine and works with neurological and autoimmune patents will take gluten and dairy out of your diet as a minimum; 80% of your immune system is in your gut.

I think if you are going to give it a shot, be strict for 3 to 6 months. Keep a symptom and food journal while you do it and see if you get any stabilization or improvements with your symptoms. If it's not working for you, then put foods back in your diet that make you happy. There is something to be said about that too.

Another good book to check out is the Wahls Protocol:

http://www.amazon.com/The-Wahls-Prot.../dp/1583335544

All these books are really small variations on the same concept.