I suffered from a concussion about 4 months ago. I was told i had pcs because my symptoms didnt' go away. i was in the hospital about a month an a half ago for a stomach issue and didnt' have any problems with it around the time. Now...a month and a half later, starting last week, my dizziness and anxiety came back full force and is quite scary. I'm dizzy and anxious of every second of every day for a week now. Can the pcs come back like that? any body have any advice?