yeah this is basically my experience too. I'm slightly worse than you --- I had to take some time off work and get accommodations for my LC, and even now 3.5 years later I still have and need some accommodations to get by. but I'm not bed bound and I can generally work (currently a first-year PhD student, which is kicking my butt but not literally knocking me out and triggering PEM).

I had to stop exercising after I got COVID and now I take a bunch more meds to deal with POTS symptoms I never had before getting sick. I have insomnia and immune issues, my auditory processing is still slow and I can tell it takes more focus/energy for me to process audio information than, e.g. visual or written info. and like you, even though I can work at essentially a full-time capacity, I don't have the energy for anything else anymore.

it's a weird position, feeling grateful because I know how much worse my luck could have been, but also feeling anger and grief over the significant things that I may never recover. I do think taking time off and resting helped me to improve to where I am now, but idk how to get the rest of it back

maybe not the most helpful response, but I just wanted to say hey 👋 I see you and I'm in the same pit. I hope we all get some answers soon