Best advice I can give is...actually do move. Some relatives can be so much easier to deal with when you speak with them on them on the phone or meet them a couple times a year for holidays, rather than being subjected to them constantly.

It really sounds like this situation is causing you stress, loss of money, and generally keeping you fairly unhappy. Your shoes are not nailed to the soil you were born on...you can actually live anywhere you like, you don't have to stay in the place that's most familiar now. If you're over 18, it's time to flee the nest. It really puts everything into perspective.