Low sugar or high sugar?

I found out a year ago i was hypoglycemic and have seen a nutrionist and everything but i still have yet to get it under control. It gets so bad to the point where i throw up and break out in a random fever. My skin is so dry and itchy...in the middle of the summer. I got burnt a month ago and im still peeling. Im always eating and drinking, ive got 20 water bottles by my bed. Is it possible that i could be having high sugar problems and not just low? Any information would be great!