Clairre I feel your frustrations. I'm going through exactly the same thing at the moment. We had 35 and 36 degrees over the weekend and poor Livvy couldn't sleep because it was so hot so I tried without the wrap and she was screaming to. I had no idea they go through a sleep degression at 9 months. I'm in trouble!
I have no ideas or suggestions to help you I'm sorry but I wish you the best of luck, hang in there, and I'll be stalking your thread to get some help for us too.