I had this exact issue and had a septoplasty procedure 4 years ago to fix it. The results were truly life changing because I could breath without being congested from dust mites. I had no idea how bad it was until I could breathe after the procedure. I can recommend my ENT specialist if you are interested. Getting this procedure cleared my nasal passages permanently and was probably THE best decision of my life. I can focus now.
Then fly to Palo Alto and get the procedure done. It costs $5K. The recovery time with Dr. Li is quick. I went back to work 2 days after the procedure. If you are suffering from lack of oxygen during sleep, you are living in a fog. Do whatever you have to do to fix it. Good luck!