If it helps at all, a peer worker I know who was told he'd never work again ~25 years ago proved that wrong long ago, gaining many new qualifications in peer work and psychology, including gaining his Master's in the field, and for about the last seven years, he's been taking on leadership roles.
I would definitely seek another opinion about that, I think they're bullshitting you - it's like that old joke about how if you hurt your hands, you say to the doctor 'will I be able to play the piano when I get better?' The doctor says 'yes', and you say 'that's great! I've never been able to play the piano before!' 🙂
I found in the early part after my psychosis, I got a lot from the fleeting contacts like going to buy clothes - it was practice at being accepted as I was, and it kind of gave me hope for future, more meaningful, connections.
What kinds of professional supports do you have in place? What kinds of peer supports do you have in place? Eventually I worked with an occupational therapist who convinced me I wasn't that disabled - and now I'm volunteering once a week in a clothing shop, just tidying the shelves, putting new stock out and occasionally serving customers.
It's completely natural to grieve, and it's amazing that you're putting your efforts now into exercising and taking your meds and getting those rote wellness planks down. Beyond the day to day, what gives you hope, @Anon1975 ?