I took 6 pills (3 days), I developed a severe cough and flu like symptoms. I have a massive headache, body aches, eyes burning, weakness all over. I went to urgent care, they tested me for the flu (do not have it) and put me on another antibiotic. I've been extremely sick for two days now (took last pill of bactrim over 24hrs ago). How long will my flu-like symptoms last?