Mikie, I have been taking valtrex for viruses since June and have been taking 400 mg of doxy for the past month for mycoplasma and c. pnemoniae (1:1024). I have had such a problem with mucus in my throat to the point that I feel like I am chocking! Have you experienced this? Also, even prior to the meds I seem to choke out of no where on my saliva when I swallow wrong- so to speak. Any ideas?