Investigate brain fog by pattern, not guesswork.

My brain fog started suddenly after Sudden onset triggera viral illnessa concussion or head injurya new medication changea severe stress perioda major sleep disruption. The most debilitating part is Sudden onset symptommemory lapses and word-finding issuesslowed thinking and poor focusdizziness and lightheaded spellspost-exertion crashesheavy fatigue with mental shutdown, which completely wipes me out Sudden onset timingin the morningafter lunchafter physical or mental effortafter poor sleepin unpredictable waves.