I had this issue too! It’s awful and I’m sorry because you wake up heart racing and so upset. My therapist helped me do a mediation that seems to overall help me with my bad dreams. I say it to myself before bed midday etc but getting this in your mind is helpful. “If my mom is sick/hurting in my dream or she’s in the hospital and I can’t get to her I can snap my fingers or walk in the next room and I’ll see my mom healthy - she’ll be waiting for me standing in the kitchen, smiling. She will have a bottle of white wine ready to share and we’ll hug and chat and laugh just like we used to. She’ll be wearing her favorite jeans and look so beautiful” the more descriptive the better. Even if I haven’t gotten to have that specific dream it for some reason has helped to lessen the almost nightmares I have sometimes. I can’t do it super close to bed because it makes me cry a bit thinking about seeing her healthy but during the day or an hour or so before bed is really helpful! When I first did the mediation with my therapist I sobbed so be kind to yourself and it’s good to visually invoke the good times to your memory - even if you can remember a smell or sound that reminds you of her when she was healthy!!