Feeling burned out with a baby on the way. Is it time to pay for caregiving?

I agreed to help my aging grandmother nearly 2 years ago. I cannot continue to care for her. My husband and I are young and are ready to live our lives for us. I am currently 12 weeks pregnant and my grandmother has become a mean and bitter woman, She brings me to tears nearly every single day. I often ask her to walk away, or I choose to walk away myself when she turns on me. I am becoming angrier every day when she starts lecturing me. She has told me to color my hair- so my husband will feel like he's with another woman, or to put my face on before I run to walmart. My husband is my only support, other members of the family try to support me when I am on edge, however they have no idea the constant stress I'm under. My husband and I decided we will be moving out of state, though I've never had a child we tried for a long time for this one and the stress cannot be good. Funny as I read this it's more like I am trying to justify my decision... I just can't do it anymore, and I don't have to. I will have a home health aide come in to check on her as she is aware, I only wish she could see through my eyes how difficult living here has been.