Having moved several times for many of the same reasons, I've found these things out:

1) It is true - wherever you go, there you are.

2) Changing your location doesn't change anything. Only changing yourself does. If you need a vacation from your family, turn your phone off. Do some avoidance therapy and stay away from the people in your life that make you desperately unhappy. If people have a habit of 'just dropping by', start letting it be known that you don't appreciate it and would like a phone call before letting them into your home. It's your space - you choose who comes into it, and it's your time - you choose who you spend it with.

I've managed to live in the same town as my two half-sisters and all their familial drama & old hurts and emotional pain fairly successfully for about 5 years now. I've limited my contact with them and made myself unavailable so that when we do spend time together it's more about catching up with one another than beating up on each other. And I don't spend an entire day with them anymore, either - it's 2 or 3 hours at the most because, hey, I've got to go to work...

That all said, if you do decide to move, at least do so with some preparedness and awareness - don't just jump and run. Especially if you're thinking of moving out of state. My husband & I moved to Louisiana a few years ago with no jobs waiting for us, and couldn't even get an apartment. The one place that would look at us required us to pay a huuuuge deposit, have $3000 in the bank & provide a statement, AND we still had to have jobs to get the keys to the place. Heh, try getting a job within a day of arriving at a new city, not knowing the way around & basically living at a La Quinta. Many employers are wary of people they consider to be transient - they don't want to invest money in training someone who's only going to work there for 6 months.

Good luck and blessings, whatever you decide.