Sounds like a difficult condition to deal with! I really hope you find what you're looking for.

Sorry I don't have a great answer, but in addition to asking here I would suggest asking on the FFXIV Reddit. I feel like there are just more people there, so they might have answers that the forums don't have.

Alternatively, rather than asking FFXIV players specifically, you could find online communities for people with your condition and ask if anyone plays FFXIV or if there are FCs for such people. You never know unless you ask!