Joining a union could solve half your problem. I’m in your exact same situation dealing with mental health issues and how they affect my job. Only difference is I’m in a union so my health coverage is top notch. I wish we lived in a country were health insurance wasn’t tied having a job but that’s a little harder to do.

Growing up we always used heat lamps in our coops but I did some googling and came across this article, they seem to know what they are talking about but idk, I am not a professional in any way.

https://the-chicken-chick.com/whether-to-heat-chicken-coop-in-cold/#:~:text=Not only do they have,a heat lamp with chickens!