Is your H in the military? Mine is retired Army and I know how stressful those deployments can be.
Anyway, what you are discribing sure sounds like MLC. My H was very hateful and mean at times and to this day doesnt remember being like that.
In a way maybe it is good that he is going overseas, this will give you space and time. He will miss what he has a home. The best thing for you to do is care for yourself right now. Its going to be a long hard road both with deployment and MLC. Get out and keep yourself busy. Take care
