You need to chenge dentist NOW!!! NO dentist should do that and they should have had you come in so they could check it again. It would bleed for more than 2 minutes but it should not be gushing and definitely houldnt be killing you so bad with pain. He did something VERY wrong. I am actually a dental assistant by prefession (long story) and NEVER have I seen a dentist act in such a matter. Are you feeling any better? Is the pain dying down. If not you need to either call them back OR go to another dentist but switch out cold and warm comressses on your mouth every 30 minutes or so ...Im sorry your experiences have been so aewful. Dentists like that give all dentists a bad rep. Ppl wonder why everybody hates the dentist!!
I would do some serious yelling.