Thought I would look in on you and your H is where my W was many months ago, staying out all night , still at home etc.
I like to keep things simple so here goes. Firstly you are only a short way into this so you will get lots of advice that will be very hard to follow. Dont worry too much , it will fall into place as time goes on.
The best advice I can give you is to concentrate on what you can control. That is you. Avoid relationship talk if you can . Relax when you can , do stuff you enjoy even when you feel terrible , cry when you need to. Do not be afraid of the future and do not be afraid to do the right thing. Let your H go , this will be the hardest thing to do and to be honest will take time.
Learn to be very patient its not a quick or easy ride , but believe me , you have been to my post and I am happier now separated than I was at any time in the last year. If someone told me that when I had been a month or two into this I would not have understood how so dont worry if you dont.