Howard, I came on to add my tuppence worth for the OP, but your post pulled my up short. So, so sad. Such a loss. I hope you and your children have found a way forward 
blah, you don't need me to say that your pattern/amount of drinking is damaging and unhealthy. One bottle of wine per night is SO easy to drink and because of this liver units all over the country are seeing upsurge of women under 50 presenting with liver failure and needing liver transplants.
Please so seek RL help - your GP is a good place to start. Do get screening blood tests done including but not limited to your liver function tests. IF you LFTs are normal, do NOT be reassured by that: the liver is an amazingly forgiving organ and will cope with an awful lot of abuse before (sometimes suddenly) decompensating. The size and shape of your blood cells can be affected well before crude LFTs will show anything up - ditto brain function, heart conduction and all sorts of other internal organs which get damaged and which we don't always associate with alcohol excess.
I totally know what you mean about being in such a high-pressure job that you literally cannot eat or drink or go to the toilet: been there, done that. You MUST find another way to 'decompress': running is a great suggestion, or you could go the other way and try meditation/yoga. Or knitting - I find that very therapeutic
.
Alcohol does help with stress and anxiety, makes us feel more confident and relaxed - in the short-term. In the longterm it actually messes with your mind, causes low mood and can make depression worse. It can also lead to more serious anxiety problems if/when you don't have the amount of alcohol that you have become used to - and so the vicious cycle continues.
You have to find a way to reduce or stop your drinking. It is far too much and it is damaging - if it's not yet affecting you obviously, you should use that as a bonus and get working on it before you cannot go back.
V best of luck.
Many people attempt to stop more than once before they stop and stay stopped. If you've stopped before and started again, ask yourself what went wrong? What made you go back? What can you tweak for your next attempt to make it more successful?
Speak to your GP, get referred for support, consider the AA (great for some people, not for everybody), there's a WikiHow 'How to stop drinking too much without the AA' if a support group is not for you.