Nightmares

I'm currently 17 weeks 6 days with our rainbow. I am not sleeping! I need sleep! I nap during the day but at night I just have horrible nightmares. They started with my husband dying, then our rainbow, then both of them. 😭 I can't take it. On nights where I'm not having nightmares all i think about is my sweet angel Amelia 😇 and the how traumatic her birth was. I already replay that day over and over and think about all the things that I should have done or said to the hospital staff. I get so upset I start crying and can't stop and end up giving myself a headache. I love this little rainbow with all my heart and can't wait to meet him/her 😍 But I don't like nights. Or sleeping I guess. Any suggestions on how to get past this?