I have had a stuffy, dizzy headachy feeling in my head for several years, not quite as painful now after 3 sinus surgeries, but still dizzy, unstable on my feet. Wondering if Cardizem (Diltiazim) I take for blood pressure and heart might be adding to the problem, seems it worsened a while after I started taking Cardizem Terrible when I first get up in the morning, eases a little during the day,.