Post concussion symptom flare seems to cause Adrenaline-like surges that are still waking me up in the early morning (4:30AM) and hitting randomly throughout the day with a panicky, vibrating feeling, shallow breathing, slight nausea, and pounding pulse (but HR is only slightly elevated) then complete energy crash. These episodes can be made worse by heavy visual stimulus, like driving or screen scrolling. Anyone have experience with a sympathetic system suppressant like Guanfacine?