I HAVE TAKEN NUMEROUS ANTIBIOTICS, BUT IT WON'T GO AWAY!!!!!!! HELP (10 PTS)!!!!!!!!!!!1?

I have this mucus in my throat when a real nasty cough. It started maybe 3 wks ago. I have had it b4 so at first, I started treating myself with leftover sulfameth w/out going to the doctor. It wasn't going away so he prescribed this other medicine instead. However, this one couldn't be crushed up (I can't swallow pills) so I was unable to take it. It was the weekend so I couldn't call to have him prescribe something else so I went back to the sulfameth for the weekend. The cough got better but just wouldn't go away. I called the Monday after & he prescribed amoxicillin in a liquid form. I took it but I didn't measure it out & just guessed the amount. I called 2 days before I was supposed to stop taking it & told him the cough was still lingering on & there was still mucus in my throat so he prescribed azithromycin instead. I immediately switched over to that - liquid form (5 days). The 1st day I didn't measure the amount. But today I did. Although it sounds better, it never completely goes away & there is still a lot of mucus in my throat. I can't spit it up b/c of my severe gag reflex. HELP!!! Why is it not going away? Should I go back to the doc? Do u think maybe the bacteria is gone but there is just leftover mucus that I maybe need to get rid of w/ Mucinex or something? I haven't disinfected the house at all so maybe that's the problem but I frequently wash my hands & sanitize. My doc didn't think it was a virus b/c a virus would have went away w/in a couple days. Also, I have been staying up till around 3-4 AM & sleeping in late till like 3-4 PM. This doesn't have to do w/ it, does it? Plz help, I have my first date Mon & I don't want to still have this. Advice? Thx!!!