Sorry to hear you're struggling Mollusk, to be honest I think lots of people will be feeling similar anxieties on some level at the moment - even the ones who are gleefully blitzing WhatsApp with memes about getting shitfaced and hitting the clubs. For one, I'd be incredibly surprised if that actually is on the cards by June, but it seems more realistic that even a gradual foray into socialising again over the next few months is going to be a fairly fucking weird and scary adjustment for everyone.
And I think I get what you mean about how this situation has shifted the tone of friendships. In quite a few of my WhatsApp groups at the moment, several times a week someone will invariably drop a generically supportive message - "Another week down!", "We've got this *flexed bicep emoji*", and so on. I don't mean to sound ungrateful because I really do appreciate my friends' efforts to keep everyone afloat, and I know loads of people don't have any kind of support unit, but... at the same time, I'm sort of sick of friendships existing in this brittle limbo where the original points of commonality and shared experiences that they were based on now just feel really upsettingly far away. As you say, I truly miss just chatting about stupid inconsequential bollocks. We're told to not bottle things up when we feel shit and to talk to people, and while I certainly don't disagree in the grand scheme of things, I know that if did that at the moment every time I felt low, by now, I'd just be a constant daily irritating miserable burden on everyone I care about, and I don't want to be that. I'm scared of forgetting how to be/have fun. (Apologies for being an irritating burden on here instead!)
It is a really bizarre, overwhelming and frightening time, for everyone I think, regardless of where they stand on the "wanting to go back to normal" scale. I'm really sorry you're struggling too Glebe, I can imagine this must be an absolutely awful time for anyone who suffers with anxiety and I hope that as you say, the positive bits of news are offering some respite.
The fate of smaller and independent venues (pubs, clubs, theatres, bars) is a real worry for me too and it's one of the things that makes me less sure about actually wanting a return to 'normality' if 'normal' doesn't contain these places. I'm donating to crowdfunders where I'm aware of them/when I remember, and a few places I used to like going to in London (the RVT, the Union Chapel, the Black Heart in Camden) seem to have been pulled back from the brink for the time being but realistically I don't know how long these places can stick it out until they can safely open as before, especially as London rents seem as vicious as ever.