After spending the night coughing so much I vomited (tmi, I'm sorry!), I gave up and went back to the urgent care today, bless them for being open on a Sunday. Anyway, I got some prednisone tablets, some decongestant, and a cough syrup with codeine in it to take before bed.
Hopefully this will clear it up.
I also wanted to thank everyone for their suggestions in my previous post about this. I will definitely keep them in mind for next time!