Stars, I haven't posted here before, but want to offer you my support. I've read all your posts, including the old ones under different names.
10 years ago I was in a very similar situation to you, with a verbally (and occasionally physically) abusive alcoholic partner. I finally found the courage to leave, and stayed with family until I found somewhere else for me and my 3 year old DS to live. I've been happily married to my DH for 6 years now . Please believe us all when we tell you that life will be much happier away from this useless man.
There is a little exercise you should do which will help you whenever you have a wobble, and will also clarify the extent of your DH's drink problem.
Sit down and work out how much money his habit/hobby is costing evety week.i.e.
Gin and tonics at home (£15 for bottle of gin + mixers) = £20
Drinks in pub @ £2.50 per pint, X 4 pints per night, x 5 nights per week = £50
Take-out booze for after the pub @ £5 per night X 3 nights = £15
Taxis home from pub when too pissed to drive @ £7.00 per night X 5 nights = £35
Meals in pub when can't be arsed to come home for dinner = £7.50 per night X 2 nights = £15.
Total for week = £135
Now, obviously I'm guessing at the above figure, but judging by what you've told us about his drinking habits over the last 3 years I don't think it will be that inaccurate. Especially as I haven't factored in lunchtime and work-related boozing.
This all adds up to well over £550 per month
Even if this reflects an unusually hard-drinking month, I bet the average figure is never less than £400 per month.
What percentage of his take-home pay does that represent? How much do YOU spend on hobbies and social life for yourself and your DCs?
Working out the financial costs of his drinking will be extremely useful ammunition when you come to discuss your situation with family, solicitors, GP, Women's Aid etc.
Saying your DH drinks too much could be seen as just your opinion. Telling people he spends at least £400 per month on alcohol and related expenses is not. It is FACT.
My ex-DP was spending an incredible 25% of his take home pay on booze (and weed ). Keeping this in mind helped me whenever I felt guilty about leaving.