Should I start taking allergy meds before or after surgery?

Hi all! Thank you in advance for taking the time to answer my question. I have seasonal/pet allergies that give me a pretty much constant runny and/or stuffy nose. I usually don't take meds for them because they make me loopy. Due to my symptoms, though, I'm constantly rubbing, blowing and wiping my nose which I anticipate would be inadvisable following my upcoming surgery. I usually can only breathe through one nostril at a time when I'm at home (my guy came with a cat!), and I would think the inflammation from the allergies would exacerbate the post surgery inflammation. Would you advise a patient in my circumstances to start taking allergy meds before surgery, or after? If after, how soon after? Thank you again.