@warrio202105, Welcome to Connect. I am sorry to read that you are being left on your own to deal with fatigue after your transplant. In reading that you are also affected with narcolepsy. I am not familiar with narcolepsy myself, but did have a student once who suffered with it. And he fell behind in class work. Once he received the diagnosis and the right treatment his life in the classroom changed dramatically.

Here is information about Narcolepsy from Mayo Clinic. I hope that it provides some helpful information.
https://www.mayoclinic.org/diseases-conditions/narcolepsy/diagnosis-treatment/drc-20375503
Have you ever seen a Sleep Specialist?