Was driving in reverse slowly and hit a fence. could that cause concussion? didnt hit my head just worried about aceleration-deceleration. chances?

It's Possible: To get concussion without actually striking head but if you really were driving that slowly it is unlikely. However watch for signs, Common Symptoms of a Injury Nausea Vomiting Headache Double vision or visual disturbance Trouble with bright light or loud noise Feeling sluggish Feeling foggy or groggy Concentration difficulties Memory difficulties