Treating everyone around me like crap how do I stop?

I moved Phoenix to Bremerton wa a few weeks ago and have been very angry sense I have arrived. I had to break up with my gf because of my transfer and she ran off and met someone 2 days later. The food in Seattle sucks and I seem to take it out on every waiter or waitress at every place I eat at. My parents live up here and are like plenty of fish in the sea they did not cause this problem. So far the new city sucks it's a slum and I hate it. Bsck in Phoenix I had friends good food and my gf. I really miss her and I feel like this is only going to drive me even closer to going insane. Like today in the store I was so angry shopping I rammed my cart into an old lady cart and said **** off. In az I was not like this I was friendly and got along with everyone. I was into truck pulls and rodeos and that does not go on up here. My dad says the neighborhood is starting to talk about how rude I am towards everyone else. I slammed the door in one kids face because he was trying to sell some candy or somthing I am very bitter and hate where I live will it get better or not my parents are like we will give you some money if you want to go back to Arizona if you just promise to not return we love you we just don't want to deal with this **** anymore my mom even got on the phone with my ex gf to get her to talk to me but she could not get threw. My dad even said we will bring her to town for a week if that's what it takes to end This