When you get impressions down for a crown, and a temp made/put on they use cord, and pack it around the gums slightly under the tissue (So that you have a good fit when they crown comes in) It always made me queasy to watch.. That is quite a bit of trauma to your gums and now that you are no longer numb you are noticing the pain. If you started to shove stuff up under your gums I am certain it would bleed.. This is the same scenario, I've seen people bleed like stuck pigs, some not at all, and some just leave with horrible bruising on the gum tissue... It's all normal.. You probably just re-irritated the gum tissue which caused the bleeding.. If it was beginning to abscess the dentist would have noticed, abscesses don't just pop out of nowhere there is an underlying cause such as decay, or a failed root canal.
Teeth with fillings are also commonly sensitive to hot/cold/water/etc... It's unpleasant, and thats why getting the tooth/teeth crowned (if the filling it too large) is sometimes reccomended, along with many other reasons.. My teeth are sensitive to hot/cold/water and I've never had a cavity in my entire life primary or adult teeth, it's just how my teeth are.
I am certain you have nothing to worry about.
Temporary crowns are not always perfectly smooth because its just a paste that sets up hard in a mold of your old tooth, they just didn't grind it down enough, but take too much off and you're left with a silly looking, too-small tooth, while you wait for a permanent crown.
Dentists like everyone else make mistakes, but they go through all that schooling for a reason. You're fine and everything you are experiencing is normal under the circumstances..