Sleep Apnea Treatment

I have had sleep problems for years. When my only child died from cancer, my Dr put me on xanax. After 5 yrs of 6mg of xanax a day, I decided to go to detox. Now, 6 months after detox, I am unable to sleep. It takes me 2 or 3 hrs to fall asleep and i wake up every 2 hrs. I am so tired and weary. Dr. put me on ambien and then lunesta. The side affects were horrible. Everything from headache to lousy taste. Now Dr. has put me on 1/2 mg xanax a night. It works but I am afraid of needing more as time goes on. Anyone that has an answer, please help me