heartbroken

So I've been single since July 3rd. I only remember that because of the 4th. But I'm having such a hard time moving on. My stomach gets this sickening feeling every time a guy kisses me or just talks to me. And it's like I just think about my ex all the time. We don't talk anymore. But I'm ready to move on but my heart isn't. Idk what to do. I'm in college and I have a part time job. But it's with all women. So I'm not sure what to do.