Try and stick it out. It really is important, and you could have a really hard time finding another job if you do not stick it out. I might be dating myself here, but the goal used to be at least a year at your first job if you have any hopes of finding a new one after. Can you take a few days off or have someone come visit from home? Find a new support network where you live. There are lot of new grads who would do anything to get into a new grad program, so try to step back and look objectively what you would tell someone else in your shoes. Can you change shifts maybe meet some new folks, change scenery?