Wow, poor you, that sounds awful for you and the kids. I wrote my first ever post on here yesterday about the lack of help I get from my partner with our baby and the house and my god, he sounds like a saint compared to your husband. You must be totally exhausted, fed up and very resentful.
I presume you have tried to talk to him about it all?
I agree with Thurderbolts - the amount he is drinking is not healthy at all. As many men do, he is getting through his unhappiness by self medicating with drink.
It really is so unfair on you and your kids. If he has problems and issues then that is fair enough but he MUST sort them out to be fair to the family. If he can't or won't try and get help them perhaps it's seriously time for you to think of the future without him. Hard as that is. If there is a bad atmosphere in the house the kids will pick up on it, it will affect them and how they see relationships. I am very much in favour of kids having a mum and dad together, but not if it is too detrimental.
As my health visitor said to me, you, as a mother need to be happy to function properly, to look after your kids properly, to be patient with them etc. If you are unhappy and stressed all of the time it will show in your attitude.
You deserve to be happy, you deserve to be supported by your partner, you deserve to have a partner who helps you with the kids, the general running of the home. He is a grown man who needs to start accepting responsibility for himself and his family.
Seriously, it wasn't until I had my baby last year that I realised how truly amazing we women are, what we have to put up with, the amount we take on when we have kids etc.
Stay strong, be firm, let him know how you feel and that you can't tolerate his behaviour anymore
Good luck.