Thanks for posting your query.
Are you getting fever?
Presence of mucus , headache, blurry vision indicates some infectious etiology and involvement of sinuses
You may have myalgia
due to bacterial/ viral infection.
Yes...as you have past history of cavernoma resection, this possibility can't be rule out.
You should consult with physician and ENT surgeon and should go for CT/ MRI scan brain to rule out intra-cranial pathology.
Cavernoma is not a tumour and doesn't predispose to formation of brain tumour
You should take antibiotics, anti-inflammatory and anti-histaminics.
Dr. Mayank Bhargava