Are you having any fever ?
If you are having yellowish nasal discharge, it could be infection. In this case, kindly take a tablet of Levofloxacin
once a day after a meal for 5 days, under medical supervision. If you have fever, you can take Acetaminophen
tablet for relief, under medical supervision.
Also take Tablet Cetrizine
to reduce nasal discharge. You can take a Cough syrup like Chericof to reduce chest congestion.
Hope that you get cured for your Surgery.
Wishing speedy recovery.