Suggest Remedy For Headache And Left Eye Twitching After Accident

I am 53 yr old female in car accident Friday hit from behind. Car that hit was doing 40 mph estimated we were at a complete stop. I did not hit my head on the front, but it did wip front and hit back on head rest. I went to the ER due to back pain neck pain numbness in feet and everything checked out. THEY DID NOT DO A CT SCAN on my head. i have had a headache since and my left eye has been twitching off and on now since Friday night. Should I go back to the E R