Carbohydrate intolerance?

Hello, I've been having a lot of symptoms for the past 6 months. At first I was having diabetic symptoms like increased thirst and urination, dizzy after eating. I've also experienced migraines since I was 10, but they started happening behind my eyes. Then I discovered it was worse after eating sugar. So I had an oral glucose tolerance test done in January. My blood sugar was a little high, but not diabetic (around 130). My doc said I was borderline diabetic and to eat small meals low in carbs high in protein. I did this and also cut out all refined sugars and carbs. I can't even eat high sugar fruits, I mainly just have berries. When cutting out sugar I wasn't thirsty all the time, and I was less dizzy. But starting in March I began to have other symptoms.
Now I have numbness/tingling in my hands and feet. It started in my right hand, then right foot, now both hands and feet. Although it's mainly in right foot almost all the time. I've also had tingling in my mouth/ tongue. I also feel like I'm getting weaker every day. My arm and leg muscles feel like jello, and it's made worse by heat and exercise. I've also been experiencing mild eye pain and facial pain. I just recently had a blood test to test for B12 deficiency and had a full metabolic and thyroid panel. Everything was normal.
Occasionally I get stomach pains after eating. I think it happens when I eat sugar or high fiber carbs (like oatmeal or whole grain cereals). I also get a lot of bloating, especially after consuming sugar, and I get constipated occasionally. I've tried eating less wheat products, and tried to go on a gluten free diet for 2 weeks (although I'm not sure if it was completely gluten free). No dietary changes have seemed to help with the numbness/ tingling and weakness. But I really think my body has difficulty processing carbs. I'm thinking it still could be a carbohydrate intolerance, or Magnesium deficiency, or an autoimmune disease like MS. Sorry this is so long, but any advice anyone has would help a lot!