i got searing headache when using nasel rinse. I had sinus infection and was using with no problems. Was out on bike in cold weather – when I returned

Since you were outside in the cold, the temperature of your nasal passages and the temperature of the solution were probably not in equilibrium, which can create a burning or stinging sensation. Next time I would wait until you are back to normal temperature and try to perform the rinse again. If the pain continues, please follow up with your doctor.