What if the surgery doesn't help for sinus surgery ?

First, be patient, recovery from surgery takes weeks (occasionally months).

If you aren't better at that point then there are many possibilities including allergies, immune problems, fungal infection of the sinuses, scarring from the original surgery, sinusitis involving sinuses other than those originally operated on, etc.

If you have these kinds of problems, it is critical that you see someone who is well experienced with medical treatment of patients after surgery.