You mean literally you had a black eye?!
Call the damn cops! I don't care who goes to jail, call the damn cops!!! Look, you are in a really fuc*ed up situation that you need to get out of RIGHT NOW. To hell with the emotional consequenses, there's time to deal with that once you're SAFE. We can exclude the religious aspect and still see that NORMAL parents don't tell their 22 year old daughter that she's just a child and has to stay at home. Your family has some serious problems and needs professional intervention.
Now you're really seeing the extent to which many Jehovah's Witnesses will go in order to maintain control. I remember when I turned 18. Now 18 in Georgia is a legal adult, you just can't drink. (It's 18 Francois, not 21) But you can legally enter contracts, vote, go in the military, you're not considered a minor. I remember having plans to "get out of Perry". I was told that while the law may consider me an adult at 18, I'm not really an adult until the elders say so. And as far as I know, the "wise" elders of Perry have yet to consider me an adult at 31.
Here's the deal. You are an ADULT. You've been an adult for 4 years. (I think 18 is pretty much universal in the U.S.) So if you're still living with your parents and they have the kind of control over you that you're describing, you'd better not be handing them a rent check every month. Otherwise, it's time to find someone else to hand that rent check to. I'm getting the impression that the control goes beyond psychological and into literal physical control. And in that case, it's time to get the law involved.
Whatever you do, just GET THE HELL OUT OF THAT HOUSE!!!!!! But I will say this. Don't use a relationship for that purpose. If you're planning on moving in with your significant other, make damn sure you're not getting into yet another bad situation. I notice you said you were going to New York to "patch things up" with your boyfriend. What exactly were you "patching up"? Is this a relationship with a real future? Err on the side of caution. Get out of the parents' house either way, but do it right the first time.
And keep us posted. If you need any help or someone to talk to, we're all here. My email address is in my profile.