Rebuild the missing context
Assume the recipient will not remember every date, promise, or earlier conversation. For a message about how to support someone with chronic fatigue, use this factual base: use the person's description, note the access barrier or practical need, and avoid guessing about severity.
Say what needs to happen next
State the decision, information, or practical action you need and include a real deadline only when one exists. Ask which accommodation or form of help is useful and follow through without making it a favor. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Avoid making urgency into pressure
Do not demand medical proof in a personal relationship, offer cures, or frame disability as inspiration. Use qualified clinical or emergency care for urgent health concerns and the proper rights process for denied accommodations. Do not make the other person responsible for reducing the discomfort that prompted you to write.