Feeling hopeless and alone

My baby is unhappy most of the time. She will be 9 weeks on Thursday and it’s been going on awhile (what feels like forever). She’s only happy when laying on her back, almost exclusively on her changing pads. Most of the time she’s happy feeding but there’s times she’ll cry then too. As soon as we swaddle her and/or pick her up, it’s game over. Here lately she’s also started a screaming match before every sleep session (nap or at night). I know she has reflux so we started medicine for that, but I’m not sure what else could be making it this bad... she doesn’t like being held or rocked by my husband and he has a short fuse anyway so the screaming makes him mad. I have no family or friends here (we moved here in april) and I have no one to help because she only cries with him. She’s been sleeping terribly the last couple of days and so I’m about ready to fall over and pass out. I’m getting 20-30,000+ steps a day just in my house bouncing her constantly. I even thought about self harm the other day, which I haven’t done since 2013. I don’t know what to do.