Name the impact without exaggerating it
Describe who had to wait, worry, redo work, spend money, or make a choice with incomplete information. For a message about how to support someone living with epilepsy, use this factual base: use the person's description, note the access barrier or practical need, and avoid guessing about severity.
Make repair practical
Offer the repair you can actually complete, with ownership, timing, and any limit stated honestly. 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.
Let future behavior carry the proof
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. A promise inside a message is weaker than a visible change in what you do after it.