Very bad throat pain after Rhinoplasty- Help! Advise?

Unfortunately this is a common problem and it's due to the back of your throat (pharynx) getting irritated from the endotracheal tube. This could have occurred during the incubation or from the tube rubbing the pharynx during the procedure. The Anesthesiologist needs to be very gentle and careful putting in the tube and then routinely using a throat pack during the surgery to prevent irritation. This pain should dissipate over the next week. Let your surgeon know and have him examine the back of your throat.

This is related to the anesthesia. Definitely discuss this with your surgeon and the anesthesiologist. A course of antibiotics that treat oral cavity microbes may be helpful.

This is likely from the intubation, could be from a traumatic technique, or even from acid reflux as a result of lack of airway protection. 
The best thing for this is to suck on ice. You may want to consider an anti-reflux medication/avoidance of alcohol/certain foods as well in the short term. 
This will resolve! If not, would be a good idea to consult your GP.