I'll echo the contra dancing suggestion, though waltzing with the right partner is also good.

Contra is very energetic, and fast enough to require that you leave all outside cares behind when you enter the dance. It's also (in the places I've done it) more of a group social event than a meat market, a gathering of dancers rather than a secondary activity to romantic pursuit.

Aikido was also good when I was depressed or stressed by work. When the ground is coming up to smite you, there's no time to be thinking about work or life or whatever is bothering you. If you don't leave all that behind, you get a sharp reminder to concentrate. Does karate do the same for you?