Well it's a hard situation to grasp only via a description on the net. I'll do my best to give an unbiased thought through answer.
If you truly do love your husband, and enjoy your life with him, and the only problem is his anger-issues at work and all that comes with it, then I don't think you should leave him. Atleast not permanently.
It doesn't have to be all black and white. You could give him a dilemma though. I'd say tell him, and make sure he understands that you really mean it, that you have had it with this issue and if nothing happens, drasical changes will be made. If he still refuses therapy and/or medication then maybe take your relative up on the offer on living with them and completing school. That way he might get some time to think things over and get his priorities straight.
If you do this however, try to still keep contact alot and ofcourse let the man see his kids whenever he wants and has the possibility to come see them.
This way you get to complete school and will be set for the future, and he will have time to maybe realize that this is serious sh*t. This way you can get back together as normal when you are done with school and he hopefully bettered himself. If not then maybe it is time to split up.