How do i get rid of a bad sinus headache without medication?

Water, water, water: You might want to try drinking a lot of water so your body is well hydrated. The theory is that mucous will be made thinner, and may have a better chance of clearing out. The 2nd use of water would be a hot shower or 'steam treatment' - take your time soaking up the steam, it should help open up the sinus passages and thereby relieve the headache. 3rd, a wet hot facecloth over the headache areas.