Nyquil and Dayquil are exactly what you needed...decongestant and antihistamine.
you have to stop the drainage from getting to your lungs.
i used to recommend Nasacort to dry up your nose but it causes depression.
there's supposed to be a replacement for it that is non steroidal.
if you're not coughing by now, you're lucky...mine lasted a month both times i had it.