What did I get stung by? It's a small bump with a stinger in it, I thought it was a wasp because the camp has a bad sand wasp infestation but it doesn't sting...it hurts, and even though it's a small spot it makes my whole leg hurt.

A wasp sting can cause what youre describing here so you may be having the start of a allergic reaction to it so you may really want to head for a ER for help here before it gets blown up. It best to go now before an ambulance does come and get you.  Even a Urgent Care center can help here so get it checked out