How long after l fess sinus surgery for result. Ct scan 3 dys ago-clear. Bad pain left side of nose. Ent said no infection even with green/red mucas?

May not be sinus. If your ct scan was perfect then whatever problem you have may not be your sinuses. It may be your nose and some superficial issue or superficial infection. Are you irrigating your nose with a neil med type system? If necessary seek another opinion with a sinus surgeon.