It seems to me that the fact your symptoms are tied to specific situations, rather than being there all the time, could be something to build on. That doesn't make them any less real or difficult, of course, but it does suggest you have a symptom-free baseline to work from.For me my symptoms just come when I do anything ambitious.
A new job, promotion at work, college course, a new challenging hobby, working two jobs etc
Those are literally the only times I get symptoms.
I find life boring, but the second I step out of that boredom, the symptoms come, my body shuts down and I can barely function.
I can only speak from my own experience, but I've found that 'the work' has been to gradually do the things I want to do despite the symptoms. Not by throwing myself into something overwhelming like a new job, but by choosing challenges I can control, such as a hobby, and introducing them in small, manageable steps.
My own symptoms were extremely severe for many years—I was bedridden and housebound—so I know how hard it is to keep going when your brain is screaming at you to stop. But what has helped me is discovering that the symptoms don't have to make the decisions for me. The more I've been able to continue with meaningful activities, even in very small doses, the less threatening they've become.
I'm actually very similar to you in that anything new or challenging can trigger symptoms. But for me, avoiding those situations only reinforced the pattern. Gradually facing them, at a pace I could tolerate, has been what started to break it, and continues to do so.
That's just my experience, of course, so take from it whatever is useful, if anything.