It sounds as though he is maybe under a lot of stress on the work front and possibly worried about his position.
Men can be so much like petulant 3 year olds sometimes - as in the ring throwing!

You need a reason for a divorce even these days and they are not just "given".... perhaps he will have calmed down this evening, but to go straight into a divorce action is a bit extreme. Some sort of Relate counselling sounds a good idea to get back on track (although I think there is often a long wait)...

Hang in there - the Forum has so much good advice and I am sure that with the help of those who have already been through this, you will get loads of support.

Hugs