I think i have herpes...

So i've been dating this girl about a month and we've been having unprotected sex and i just noticed i have a "pimple" on the side of the head of my dick and a small rashy part and another bump halfway down the shaft. I am so scared right now i know i wont sleep tonight. I'm gonna try to get in with my doctor tomorrow asap. Feel's like my life is over. I hate myself for being so stupid. I haven't had a partner for over a year besides her so if it turns out that that's what it is then does that mean that she is probably the one that gave it to me? I'm so scared right now. I can't think about anything else...