I quit my job today and am officially unemployed. What should I do?

I'm a 24(f) and a features writer. I left my job at e-commerce website for a budding PR agency thinking it was the right move. But three weeks in i understood that this place wasn't meant for me (There were other factors like travelling expenses too). I finally had the courage to quit today. Now I do feel relieved but the fact that i'm unemployed is kicking in. Last week I had 3 job prospects but as of now only one may have the potential to turn into an opportunity but that too is something i'm not really very excited about.

I feel depressed and rather broken. The regret that i may have risked it all for absolutely nothing is the worst!!!