Hi Laura. I had a chesty cough and sinus infection for weeks. I took Grapefruit seed extract capsules 570mg 1x twice a day and N-acetyl cysteine 600mg 1x twice a day. Also 1x tsp coconut oil 3x a day, and 2x tsps Apple Cider Vinegar in water 3x a day. I was pretty breathless most of the time so I also took B12 because I had read it could help. Also extra vit C and more water. I started to feel better the first day and within 5 days, really good. I made sure I didn't have sugar either, and had plenty of veg.
I hope this will help.