You're not the only person on the planet who is drinking too much, in debt, and doesn't know where to turn.
As you're obviously competent with a computer, sign on to www.moneysavingexpert.com, give yourself a user name and join their forums. There's a Debt section of the forum and you can get lots of helpful advice there on how to go forward, as well as support from others in the same situation.
Please do this for the sake of your children. And check out for the nearest Alcoholic Anonymous group, where you will also get some support. Having watched a relative destroy family, marriage, health, employment because of drinking, you need some help now. You obvious have money in your pocket to spend on alcohol. Give your money to somebody else to look after if you don't trust yourself. If you value your relationship it's important to realise that even bad situations can be turned around with support and determination, so make this the day when you start making a few decisions to turn your life around. Once you've got some positive actions under way you will probably start to feel more positive and in control of your situation.