About to break 😭

Im 34 weeks with our third boy. Our oldest who is 4 was diagnosed a few months ago with a syndrome that causes progressive hearing and vision loss as well as joint problems. His vision has worsened and we are really struggling with the diagnosis. We found our there is a 50% chance our new baby will have the same syndrome which breaks my heart to see my kids struggle. We realized that our house isn't going to work for us as there isnt enough room on the main floor for all our kids and we just can't put our oldest in a upstairs room. We had found another house that would work better for us and listed ours for sale. The other house sold from under us and then shortly after we got a good offer on our house so we just went with it hoping another house would come available. We close in about 2 weeks and I guess we are moving in with my in laws until we find another house......I have not had an easy pregnancy I have had several minor complications. Last week I was in the hospital due to really low blood pressures. The following day my husband's 3 grown ass siblings were at his parents house. My husband and I went over to move some stuff there and I asked his brother for help carrying in my kids bed. He looked at me and was like eh it's hot would rather not so my husband's brother 2 sisters and dad who all heard the convo sat on the couch and watched me carry in the bed by myself. My husband's mom did jump in and help us the rest of the day. Like I get moving is no one else's problem but at the same time to sit there and watch very pregnant me struggle moving heavy items literally 18 hours after being in the hospital and not offer a little help makes me so mad. My husband and I kept moving stuff without help from them and at one point my brother in laws 9 month old started crying and I looked around to see that my husband's siblings were all gone. I asked his mom where they went and she said to the lake. So not only did none of the siblings help us they all ran off to the lake and left us to baby sit AND move. I seriously don't think i will ever forgive them for this. I have over done it and have began having a lot of contractions the last three days so my doctor has grounded me. I'm not allowed to help move anything this weekend. I'm so stressed and angry.. my husband is being an ass hole which happens when he is stressed so we are currently not speaking because neither one of us can be nice. I just want to lay in bed and cry. I feel alone and angry and like nothing is going right and I honestly am not holding it together.