I would counsel - choose some exercise. Walking to a spot to paint is a start. But the thing about dancing is, when you find the right club/regular series, it won't seem like exercise. Because the music lets you anticipate (subliminally) and the stress on the body is minimised. And it feeds the brain, and it uses social skills. The latter is what you got with the friends you had at work.

You have to look at what uplifted you and find suitable replacements for them, lest you grieve, and grief is harder to recognise in yourself. You know the aspects you didn't enjoy but surely they are no longer foisted on you.

But finding what works is a project in itself, and may not be for ever. Butterfly minds can be rewarded enormously. Trust me.