Update: Narcolepsy Type 2 (assumed, chasing this) and Type 2 Diabetes. The latter seems to be creating the first, due to orexin depletion. The time it took me to get any suggestion that this was the case, is amazing. I've seen nothing but confusion as to which causes which, and nobody will directly address this.
For the life of me I don't know why this is so difficult to research and get answers. Meanwhle, my doctors are full of administration and not following up on their promises. They're interested in booking appointments for specialist referrals, more admin, and assigning more pills that make me feel horrible.