I had major sinus problems due to an infection that was never treated properly. I should have gone to the doctor sooner and when I did they mis-diagnosed it. It got into the bones of my skull. I eventually went on singulair because I had asthma. I thought it was the prednisone I was on that was making me weak. It was the singulair. I was on it about four and half years. I withered away to nothing. They said it would help my sinuses. I was constantly getting sinuses infections and using prednisone until I stopped the singulair. My muscles completely atrophied. I couldn't even get up from the floor or walk or even stand up for long. Once, I got off singulair my breathing got better, my sinuses even got better. I've been off about 15 months and am getting stronger but I still have a long way to go to walk and get out of the house. I used to take it at night and I immediately would feel to tired to do anything. While I was on singulair I was always getting what felt like the flu or colds. My asthma and sinuses were helped greatly by upper cervical specific chiropractic adjustments. You'll know if it is the right kind of chiropractor because he will use a dual probe on your neck to measure a heat reading. This is called pattern analysis. They only adjust the upper neck.