OK, for two weeks I have had a sinus problem, headache all day, coughing fits from post nasal drip and general poopy feeling. I have an appt with doc on Thursday so I figured I would wait until then. I looked up home remdies on google and found a lot of talk about apple cider vinegar (ACV). Most said to take 1-2 tablespoons in 8 oz of water and drink straight down. What the hell, I gave it a try. Now it could be coincidence but I slept through the night for the first time in days and no headache or coughing. I have been doing it 2X a day for two days and I am feeling great! No harm in trying!