Worried lead to sadness........

I am really worried. My current salary is really only enough to cover my basic. Even I purchase some item, I would be really hard to cover. I feel really sad and blame myself for all the stupid thing I done. Stupid mistake, stupid action, lead to stupid consequences. It's scarry to see my bank account going our is higher than coming in. I can really feel the mind keep worried for the problem that I maybe facing... and I am going to Singapore soon, for another spending, I will not have enough money to cover. What should I do?