It's' good (and painful and disturbing I know) that you're recognizing this. There's a reason it feels so bad, and that's because it just isn't right for your health anymore. Some situations are toxic and they really do make us sick. The next step is to gather the strength and resources to do what you know you need to do. Let yourself cry, and be upset about. But ask yourself how both your own and your partner's actions have contributed to this deterioration of your health, this isolation from loved ones and other issues. The key is to eliminate all negative inputs, and since you only really have control of your own actions, this is something you'll need to do on your own.
If breaking up face-to-face is not a safe bet, then please get to a place where you can make arrangements with family and perhaps a domestic violence support liaison. You'll receive the help as well as the crucial advice needed to make a quiet getaway from an abusive household.