Nervous about going back to work

I’m going back to work I about two weeks and my husband will be caring for our LO two of the three days I’m at work. I’m super nervous bc he hasn’t been caring for our LO much he currently works and is in school too. I know that some of it is bc he is tired and need time to himself ect. But there have been many days that he hasn’t even held our LO just does his thing. Like he doesn’t want to deal with him. He has been super colicky and recently got diagnosed with acid reflux. Every time he cries and my husband tried to calm him I end up having to calm him. My husband gets frustrated and has negative energy when dealing with our son when he is crying. When everything is good he is super loving towards him and it melts my heart. I nervous about leaving them together and our son starts crying. My MIL would normally be his go to but she will be working the second day I go back to work. So it will be them two for 14ish hrs.... the longest time they have been together along is like two hrs. That was before our son got colicky. We have other family close but my MIL is the only person we trust bc of a whole other issue. Our marriage is already strained he is not sleeping in the bed he is choosing to sleep on the floor in a different room he does wake up and ask if I want him to take him or if I need anything. He does try. He thinks I’m cheating bc I’m on FB again when I really it just something to do. I can’t talk to anyone about this bc they will think that he is going to hurt our son which I don’t think he will at all & I don’t want people thinking that he is a bad dad bc he isn’t. I’m just here to vent. Thanks for reading 😘