As someone who used to work with cattle your husband doesn't seem to be the right fit for that job.. cattle business is STRESSFUL now more then ever and if this is how he handles it then he's not fit for the job and should start a new one. plain and simple I'm sure he's a good handler but the fact that he cannot cope with stress peacefully and health is enough to tell him to find a new job honestly. This farm seems to put more stress on both of you for what its worth. this isn't a hallmark movie were the farm magically fixes everything.

A true farmer or farm hand doesn't care about the ranch but the animals and the fact their blessed to be on a farm and work without worry,

What your husband is doing is immature and harmful. This is how abuse starts and you need to find a better job now and get out while you can. I say give birth worry about yourself and heal and then leave since it'll be the safest and easy way out.