Wish I could be trusting and not emotionally unstable

I am a very jealous, anxious, nervous, sometimes controlling girlfriend. My boyfriend is currently at the bar a few hours away, staying at a hotel for the night because of work, and I have extreme anxiety about it. I feel sick to my stomach thinking about the people he may be around and the girls he will interact with.. it is so bad that when he told me where he was, I googled their website and Facebook page and obsessively looked up photos of the bar/events/etc... and it just makes me feel worse. We have been through a lot, but he is a good guy and I know that if he didn't want me and only me he wouldn't be in this relationship, right? We are planning on buying a home and starting a family soon (have been together on and off for 5 years) and I hope I'm making a good choice... I just wish I could stop being so anxious and worried about him being away/drinking.... his two co workers drink a lot and are total pigs when it comes to women.... his closest friend will literally get girls from Craigslist to show up to his hotel room and have sex with them... it makes me sooooo uncomfortable that he works with these people and is at the bar with them now ):