I had a bad cough and ear infection about 3 ½ weeks ago.  I was given Clarithromycin.  I felt worse after 2 days (sinuses), so my dr. switched me to Sulfameth/tmp.  We did not know if I had a virus, bacterial infection or allergies, so I was taking my prescription, plus Mucinex, plus allergy meds.  About a week after I started on Sulfameth, I started feeling a very annoying, tingly sensation in the back of my mouth.  Thinking it may be thrush (from the antibiotics), my dr. prescribed Nystatin.  The day after I started it, the tingling went away, but I lost the sense of taste in my mouth.  I also developed a weird sour taste in the back of my mouth.  I completed the course of Sulfameth, and all other meds, last week, and STILL have no taste and the weird sour taste.   This is the 12th day of this.  I saw an ENT on Monday.  He saw a slight coating, which he thought MIGHT be thrush, but it was not much.  I have no other thrush symptoms.  He also saw signs of reflux in my throat.  He prescribed Diflucan and Nexium.  That was 3 days ago, and still no improvement.  I am very worried.  Thank you!!