I use to have horrible sinus infections. They use to affect my inner ear and would have bouts of terrible vertigo, cold sweats, headaches and vomiting phlem. These would last for hours and I was completely debilitated. It took a long time and 3 ENTs before it was figured out. It turned out to be a sensitivity to dairy. I had to check all ingredients on every package to see if it had any form of dairy and stay away from it. Going dairy free did the trick. Good luck to you finding the cause of your problem.