Hey, I feel your pain. I'm not a doc but I might have some insight that could help. From experience I could venture a guess that you're waking up cause of a dip in your blood sugar during sleep or dehydration or a combination of both and this is aggravating your symptoms enough that you wake up.

I suffered many months with waking up with headaches and not being able to go back to sleep cause of them. Now as part of my concussion routine (lol unbelievable that I now have a concussion routine but its true) anytime before I go to sleep and if I get up in the middle of the night I eat a couple scoops of yogurt or eat a little snack of quick sugar and down a glass of water. The combination has helped me finally be able to get some decent healing sleep. Give it a try, see if it helps : )