Sinus Discomfort Post-blephroplasty - Will It Go Away?

There is no relationship between sinus pain and eyelid surgery.  These are separate and unrelated processes.  I would recommend that you see you Primary Care Physician for guidance and an Otolaryngologist if the problem persists.

Sinus pain after blephroplasty is not normal as the two are not related. See your surgeon and if he thinks it is sinus pain, he will refer you to an ENT surgeon.

I think that it would be a mistake to assume that the sensation you are attributing to the sinus is typical.  It is not.  It may or may not be related to your eyelid surgery.  I think this needs to be worked up.  You should certainly let your surgeon know what is going on.  It is reasonable to have them assess you but you may need to also see an ENT for this issue.

Anatomically, the sinuses are far away from the eyelids and the areas, where eyelid surgery is performed. Either, your pain just appears to originate from the sinuses but it is really related to the eyelids. Alternatively, your sinus discomfort (and most likely you are referring to the maxillary or "cheek bone" sinus) gives you trouble as a coincidence.

You should mention it to your blepharoplasty surgeon and follow his advice.

Sinus discomfort should have nothing to do with your blepharoplasty.  I would suggest you see your primary care physician and request a sinus xray.