hello, I've felt like ive had post nasal drip the past few days but cougs have been dry, i checked in mirror with flash light and at times would see clear mucus commin down the back of my throat starting from the top above my uvula, it is also been red. i have had a runny nose to, almost all mucus has been clear. my eyes have been watery at times to, what could be up and what could i do?