Ive got brain fog constantly and short moments of clearity that follow with headaches in one same spot of my head every time. ive recently started going blind on the same side (might not be related) what could cause this brain fog?

An initial thought raises a concern of a complex migraine variant. Dysphrenia hemicranial transitoria may be occurring. However, the blindness may signal the need to thoroughly investigate vascular function. See a local neurologist and commence a full workup.

There are numerous neurologic and psychiatric conditions that can be causing your symptoms you must see a competent neurologist to diagnose these cluster of symptoms.

Sudden vision loss is a medical emergency. An ophthalmologist can determine the cause. Do not delay, since some forms of vision loss are correctable, but many are not. Also get checked for past infections with common diseases like Covid-19, Lyme disease, etc. that can cause cognitive deficiencies.