My whole ordeal started out the same way. I had a box fan aimed directly at me at night cause the room was 85 degrees. It caused rhinitis which started to block my breathing at night. Of course I instantly figured out it was the fan, and moved the fan, and had my doctor prescribe antihistamines which fixed it. I also cleaned my fan. Months later in the winter time, I started to have some other type of breathing problems and realized that it was actually alergy to dairy products, so I cut that out of my diet and the problems seemed to go away. Recently I have woken up twice with restricted breathing, and I'm thinking that some of the food I ate had dairy in it.
It could also be that I'm dealing with several issues causing this confusion. With the rhinitis, it was full bore choking in my sleep, in fact my spouse had to wake me up to tell me I was jerking my body in bed and not breating. The other problems I would have is I would sleep for anywhere from about 2 to 4 hours and end up with a blockage where I couldn't breath out, I could breath in, but not out, untill I woke up and opened my mouth, took a swallow and could sleep for a few more hours.
The odd part that was confusing the hell out of me was that these episodes weren't consistant, sometimes I could get a good nights sleep with no problem. Even odder is that these choking fits would sometimes happen durring the day when I'm out and about doing things. After seeing a specialist, he stuck a camera down my nose and said that my soft pallet looks normal, my tonsils are small to normal, and my tongue looks normal, left me guessing, what the hell is it then. Food alergies. I'm having anaphylaxis from dairy. The reason I targeted dairy is because I remember having copius amounts of it just before these episodes, and I already have a lactose problem.
Anyhow, I noticed that your post was from some years ago and I hope you still check your messages because I found something out about YOUR situation that might be your best and only option for help.
Weeks ago watching TV, a program came on about a guy that suffered from terrible alergies, antihistamines would help just a little and he was overwhelmed and to a breaking point. With those types of alergies, you can consider the treatment of the fluke worm. This is where someone infects themself with the fluke worm because after they get set up in your body, they release a generous amount of antihistamines. You just have to get checked periodically to make sure that the worms are not out of control.
The program explained this guy going to africa to infect himself by walking through human waste to infect himself. Now he has a website and sells his own poo in the states so that people can infect themself to get rid of this alergy problem. I know it sounds horrible to think of infecting yourself with a worm, but depending on how bad your alergies are, it could be worth it.
The only other thing you can do is clean and dust the heck out of your bedroom and hope that cures it.