Why are you afraid of moving, other than the obvious stressful nature of a move?

Your mom isn't behaving very well herself. She's telling you that you're a burden who's going to give her a heart attack. That's not a nice thing to say whatsoever.

If you really don't want to move, there's got to be a way for your mom to get a break that doesn't involve you moving out completely. Have you heard of respite care? I know most of the time they are kids, but there are adult day care type services you could go to and your mom could spend the day by herself. There's also the possibility of moving into a group home, locally. I don't know how much support you need--whether you need 24/7 assistance or just a few hours a day, or even a few hours a week. Depending on that, an apartment plus hiring an aide could be the answer for you as well.

What I do know is that your mom constantly coming down on you like this is not good for you or for her, and is not right for her to do. What does she think it's like for YOU to live with her constantly telling you that you're a burden to her and she's going to die because of you? That's like constantly living with someone making death threats against your mother.