I would like to welcome you to the HW family.
I would not call myself a workaholic in my present state. Maybe a little bit when I was younger and not yet diagnosed. These days I just work at a steady pace and know when to stop.
As for your husband it maybe a symptom of hypomania, that ot he is just a natural workaholoc. He could also have tons of work to so and he is trying to catch up with work, or there is someehint bothering him and he buries himself in work instead.
I hope you the best in the situation.