This morning I was walking down slippery steps and my foot slipped making me land hard on my feet (about a 5" drop, or however tall a step is). This didn't really cause immediate symptoms other than some pain in the back of my head but I now seem to have bad pcs symptoms (light sensitivity, nausea).

Is there any conceivable way this was concussive? I think I've read about someone on here getting a bad concussion in a similar fashion so I'm pretty freaked out at the moment.