Only 1 person got it right. It's not about forgetting your problems. It's about being high as F on club drugs and coaching herself through the paranoia.

It the first stanza it tells it all. Had a little bit too much.. all the people start to rush by (visual effects of being high)
Can't find a drink - (she's thirsty because thats how ex makes you feel)
Where are my keys/phone - (losing her stuff cause she just too high to know)

Then later, howd her shirt get inside out? (didn't even know she took it off at some point)

All of that, and the repeating chorus of just dance.. just coaching herself. like.. you can do it, just get up and dance it off. lost my stuff, oh well, just keep dancing. forget everything, just dance.

Then she spends her last dough in her pocko.. she's broke after a long night of partying and losing her stuff.

Come on people. This is a totally classic and typical club scene experience.