How do I quit drugs and get over my girlfriend at the same time?

Hi. I'm not usually the type to put my business out there, but I've been really sad lately and would really like people's advice. I've been partying now for over a year, binge drinking at least 3-4 times a week, smoke cigarettes when I drink, and smoke weed. I decided to leave the party scene when I blacked out friday night. My girlfriend and I broke up saturday. I've been keeping strong with not drinking. I've been antsy, woke up in the middle of the night soaked in sweat, and I'll just cry randomly thinking about my girlfriend or something that I did when I was drunk. I'm trying to stay strong, but I fear sorrow will overtake me and I'll try to numb my pain by using something. Please help