What Causes Burning Sensation In The Head While Suffering From Diabetes?

I have type 2 diabetis, which I have had for 8 yrs. I am a 58 year when I wake upold male. The problem I am experiecing is when I awake after sleeping 4 hrs or more, My head starts to get a burning feeling which becomes severe at times. It is almost the same symptoms as when my sugar level drops to 70 s 0r low 80 s. Only intensify it by 100. My hands at the same time begin to burn severely. My mouth and throat become extremely dry which makes me start to cough. My lips begin to swell, as well as my face. I have what would appear to be an allergic reaction to something. However, I havnt eaten or drank anything before the sleep or upon awakening. This has blocked my airway almost completely. Some of these (attacks) are sometimes far more severe than others. The least of these (attacks) will last for 5 minutes or so. The worst is being transported to hospital. Medics Have treated me as that of a reaction. IV hookup with Benadryl and done. I had MRI 2 weeks ago and was given a clean bill on the brain. One last thing, these attacks occur in different places. I feel there is something else seriously wrong, not an allergic reaction.