Ann, we had an infestation of white flies one year, many many years ago, but I don't remember the weather. It might have been late summer because I seem to remember that by then, they wouldn't hurt much. But they were on any leaf you bumped. We haven't had them like that since. I hope you find out why they are at your place. That's a bummer!
Laughing, nope, Hoverflies don't bite, but they sure like to taste you.
