Insect bite (I think)

Hey, I think I was bitten by a spider this morning or last night. The only thing is I don't know what kind it was. From looking on the internet I think it was a type of daddy long leg. I have heard that they can't bite but I don't know! Thats what kind it looks like. I haven't seen any other kind around here. The bite  is like a bump. BUT it has something black in it. It has made my back numb except where the bite is i can't lay on my back. this morning when i got up cleaning house every time i would bend over it hurt. Like I was pulling something in my back. Then it went numb like 30 min. later.  I know I am a bother and I am really sorry about it. I was just wanting to know mainly if there was anyone whose has had this problem or if they know anything about it. I scheduled an appointment  with my doctor but they needed to know what kind it was. I don't know. Someone please help me.