I would assume that with this great job of his--not to mention his negligible living expenses if he is living with his parents--he is paying substantial child support? If not, why not?
Having him back in the house will NOT "relieve the hurt"--it will only make you and your children MORE hurt, confused, frustrated, depressed, angry as he continues the progression of his drinking.
I second HP's suggestion that you grab whatever emotional support you can. And that includes sticking around here--this is a great forum with a lot of collective wisdom.