Concussion or stinger?

I just finished a full contact football camp yesterday, and I've gotten some helmet to helmet contact. Then I started feeling a bit nauseous (but there's a pain that comes in and out), haven't thrown up though. I've went to the bathroom and took pepto bismol. It's been in and out, the coaches said it might have been the food but it's still here. My head hurts a bit when I kind of jog down the stairs. I remember everything. I haven't blacked out or any of that. Just feeling nauseous and a slight discomfort on the top of my head.