I shouldn�t think so � certainly not to that extreme. Whilst any new pair of glasses requires some acclimation, I feel in this instance it�s more the matter of the polyp. I�m gathering that it had swollen a bit, which would have directly affected your equilibrium. If you have your old glasses and it brings more comfort to you, during this brief time, then I shouldn�t imagine there is any problem in continuing to waer them until such time as you�ve resolved the matter of the polyp. If your giddiness or matters with equilibrium continue, please be sure to visit your GP again. It could be a warning sign to other matters such as blood flow, blood pressure and matters related to the optic nerve.
I wish you every success
Fr Bill