What state are you in? Cause they way they were swarming and you saying they looked like regular honey bees but bigger again makes me wonder if they were the killer bees that are hybridizing with regular bees and have been spreading accost the county heading north for the last 30 years. The slightest sound sets them off in a swarm attack and unlike regular bees they will go farther away from the hive when they are on the attack and they also when attacking try to get inside any opening in an animal to try and sting them internally like the nose or in the mouth so they can sting in the throat and air ways. Thats how they are able to even kill large bears and other animals that normal bees usually dont kill.