Having terrible anxiety about my second baby coming because my toddler acts out soo bad. Any advice?

Did anyone else feel this way? I have a 2 year old son who I love to death but his behavior lately has been something else.. it’s obviously not all my toddler that’s overwhelming me it’s other things as well but the behavior from him is definitely weighing on my emotions and mental health a lot. I’m currently pregnant with my second and found out this month I’m having a girl. I’ve been trying so hard to be excited but I’ve felt more dread than anything and I hate that I feel this way. I’ve wanted a daughter my whole life and thought I would be ecstatic but I’m just so overwhelmed that I haven’t even got to enjoy or look forward to this baby. My hormones and emotions have been absolutely crazy with this pregnancy and I’ve been in an awful depression so I’m sure that’s probably a factor in why I’m feeling this way. But it’s the constant fit throwing, ear ringing screaming, hitting, kicking, smacking, hair pulling, etc. when he’s told no, when he doesn’t get his way, you name it that I can’t deal with. He throws fits so bad sometimes that I just have to go to the other room and cry because I don’t know what to do. Even right now for example his grandma just took him to her house because he threw such a fit about her leaving that he was hitting me, scratching me in the face, ripping my hair out, so she said he could go with her and instead of feeling “relieved” to be getting a break I’m sitting here crying and having anxiety because of the awful fit he threw and thinking I’m gonna be dealing with this while having a newborn too. He can’t fully talk yet so the only way he “communicates” when he’s upset is to just scream so loud that it genuinely hurts my ears and he put his hands on me. I feel like I’m starting to emotionally withdraw from him because ever since I’ve been pregnant he wants nothing to do with me and has been acting out HORRIBLY. It’s giving me a ton of anxiety about when my daughter gets here if he’s still gonna be misbehaving all day every day idk how I’ll be able to deal with it with a newborn on top of it because I can barely handle JUST him as it is. Im scared I won’t be able to equally divide my attention between them and then I’ll feel bad, im scared I may develop some form of resentment towards my toddler which will also make me feel absolutely horrible, im just having so many thoughts I can feel I’m going to fall into postpartum depression, I just want to be happy and hopeful and excited but I’ve had a very hard time being positive lately and really could use some advice.