Hi. Welcome.
You are frightened by your new diagnosis. Do you mean the diagnosis of type 2 diabetes last year? Is the diagnosis the motivation behind the health improvements you've made?
That loss of 2 inches in height seems odd at age 46. Do you know why that has happened? Is it from spinal compression? Have you had an injury which has caused loss of inter-vertebral tissues? Do you have osteoporosis?
I don't know what to say about that list of symptoms near the bottom of your post. Have you talked them over with your doctor? Has s/he thought it worthwhile to do any screenings or treatments due to any of those symptoms?
Why not try a gluten elimination diet if that seems a good idea? I don't think it could hurt a thing.
Do you check you BP and BG at home? If so, do occasional poor numbers coincide with incidents of feeling bad?