Bad Smell in Nose 2 Months After Setoplasty?

In addition to the previous important comments there could also be some retained foreign body in your nose. You  definitely have to be seen and examined.

The smell you are experiencing in your nose is probably secondary to some crusting as a result of your surgery. It sounds like you also had some sort of turbinate reduction procedure.  As the turbinates heal patients can form some crusting and postnasal drainage.

Antibiotics should help with this, but I would also recommend rinsing your nose with nasal saline. Also the crusting may need to be debrided in the office.

After sinus surgery in particular, crusting of dried blood and mucous inside the nose is normal.  These crusts can get quite large, block the newly created openings to the sinuses, and smell quite bad.  Many surgeons, myself included, will periodically see patients after sinus surgery to "debride" these crusts.  Without examning you, I can't say that this is definitely your issue, but it is quite common.  I suggest that you get in touch with your surgeon and make an appointment for a post-operative examination.