@AlanisMorningShed
Hello and welcome. You're 4 months 'behind' me (I'm 10 mos post-sep from a 38 yr marriage, 2 grown kids) and I want to assure you that in a few months the 'numbness' will start to creep in. Your DH may not stop the whinging, promises, harassments, and complaints (mine hasn't) but although you'll still hear them, you will find yourself reacting to them less and less other than with a sigh and a sense of resignation.
And remember that you do have the absolute right to put the phone down on him or not to answer it at all. I pick and choose depending on my mood and emotional 'strength'. I do have him set for Do Not Disturb from 8pm-7am because I got tired of the midnight calls. You are entitled to peace and calm, and anything you do to get it is a valid decision.
One of the things that really helped me was seeing a solicitor. It doesn't mean you have to 'do anything' but getting legal advice as to what divorce (or separation) may mean to you can be really helpful. I saw an attorney (US) about 2 months after I left and it really helped calm the fears about my financial future. I ended up going down the legal separation route as that was better for me. But again, you don't have to do anything, now or ever. But do get yourself educated 'just in case'.
Another thing was AlAnon. It's the friends and relatives 'branch' of AA. It really helped me. It does have a strong 'spiritual' component which may or may not work for you. There is also an online organization called SMART. I've never used them but others here have.
You'll get through this. Life will go on and you'll find your way.