I have what I believe is a sinus infection, but the worst ever. Pounding headache, vision changes, nasal congestion with post drip, sore throat with swollen gland and ear pain. Non- consistent cough, but have been gagging and spitting up dark phlegm. Neck feels very sore, maybe from laying down a lot. Nothing is helping, but I just started amoxicillin. I don't have much of a voice left either. What is your suggestion?