Hello @burford and welcome to Mayo Clinic Connect. I am so sorry to hear of this long bout that you have had with diarrhea. I can only imagine how fatigued you must feel.

After seeing many specialists and having so many tests, your plan to go to Mayo Clinic for a consultation is a very good idea. Do you already have an appointment scheduled? If not here is a link that will give you information on scheduling an appointment at one of the three Mayo Clinic facilities. http://mayocl.in/1mtmR63.

As you mentioned that you've tried a lactose-free diet, I'm just wondering if you have tried a gluten-free eating plan?