Based on your details you have bilateral headache with transient visual obscuration ( vision slightly blurred for some time) and eye pain
with sinus pain.This indicates mixed headache.
You should consult neurologist
for clinical examination.Blood pressure need to be checked . Fundus to be checked for ruling out papilledema
which can cause transient blurring of vision. CT scan
brain should be done to rule out structural lesion of brain
Hope this would help you