Are there any hotlines for dpressed people to call, who need help immediately?

i've been feeling really depressed today, way more than usual, i dont know what to do when i get like this nothing makes me happy and i feel like crying all the time. is there a number i can call? also i wonder if maybe i am bi[olar, because yesterday i was feeling more happy than usual, and now i'm totally opposite. i dont have health insurance but i need something cuz i dont think i can survive like this. i have a job orientation and an interview scheduled otday, and i'm not going to either one of them cuz i feel terrible. but i'm in debt and i need a job. is there anywhere where i can get help?