Welcome in H.C.M. for consultation.
I read your query regarding dizziness
, and fatique after surgery for fungal sinusitis
Since about one month had passed after your surgery and about 3 to 4 weeks is recovery period for all swelling to subside, but your age is 64 and your post operative C.T. is normal and does not show any intracranial complication so need not worry, I think you will be alright after some time if you are non diabetic and does not having any other metabolic disorder.
Please check your Blood sugar, ser creatinin, serum proteins
, and a thorough nasal examination for secondary infection as all these matter for recovery.