Morning all, I won't say "Good" because for some it is a way off being good for some time. And that is perfectly normal under the circumstances.
Firstly, a huge welcome to WiseOne. You're story is remarkably similar to mine (trailing spouse, moved to a new area, got abandoned!). So I understand how utterly isolated you must feel without the usual support mechanisms. So well done on getting through the first two months - the early months are nothing less than horrific.
Secondly, you describe something we all observe shortly after a break up: that every man and his dog is in a relationship so you feel like a social pariah. This is 'just' a quirk of the brain. Absolutely no one cares less that you're on your own but it will take you time to understand that. Absolutely no one can tell that you're husbandless, even if you feel like a beacon of loserville. And by the way, he's the loser. No you - but again, it will take a long time for him to realise that.
And really well done on the volunteering thing. That, hopefully, will be your life-saver. Also keep your eyes peeled for day/night courses (I studied a language), book clubs/quiz teams/walking groups etc - whatever floats your boat (to be honest - give it a go regardless, I've made some great friends from doing activities I wouldn't have considered before). Someone recommended for me 'meetup.com' which is a website for people looking for things to do from going to the cinema together, to cooking etc. It is not a dating site (phew!). My advice is force yourself out of the home as much as possible to pass the time. It is only time that lessens the pain, so try to keep it occupied whenever you can. When the depression stage hits (if it does) you need a routine to get you through.
As for the fear? Again, it lessons over time but it is the future that is so utterly terrifying for all of us - and pondering that is what we find so utterly debilitating. As much as you can, and whenever you can, "just" focus on getting through this morning, this afternoon, this evening. I can't say the fear has gone completely for me (although the panic attacks have gone now) but I ended up getting hypnotherapy for it (not really my usual cup of tea, but it was taking over my life so I was willing to try anything). I know others who are taking Beta-blockers or Anti-Anxiety meds, which I've seen transform their wellbeing as well. If you haven't already seen a doctor, put that on your to-do list. Also, if you feel able to: paint the bleeding house, or at least a bedroom, and buy new sheets, furniture, pictures, if you can. Don't ask me why this helps, but it just does.
And as for how he can just leave after 30 years? Answer supplied by Hobbit. Take care and KOKO.