My daughter was having alot of problems with allergies and asthma. She did many of the things you tried, a thorough cleaning, cleaning of carpets, etc, but it didn't really help much. Since I am a consultant for indoor air quality I had an air purifier put in her home and the results were life changing. She is no longer useing an inhaler, she's sleeping better, and she has more energy. I don't personally have asthma, but I do have fibromyalgia and since I've had a purifier in my home, my fibro symptoms have improved, maybe because my sleeping has improved. It's not just an air purifier, the technology that we have available is like no other on the planet. Not only do we help people who have allergies and/or asthma, COPD or orther breathing problems, we also can get rid of dust mites, pet dander, pet odors, cooking odors and even odors from tobacco smoke. This is not a medical device and we we make no claims to cure anything, we simply treat the air you breathe. If you want more info, let me know. Regardless, I do hope your doc can help you so you will feel better soon.