Start with the part that is verifiable
Separate the event you can describe from the motive or reaction you are guessing. For a message about how to support someone with an invisible disability, use this factual base: use the person's description, note the access barrier or practical need, and avoid guessing about severity.
Make one answerable request
Give the recipient one concrete question or next step instead of several emotional jobs at once. 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.
Leave the recipient in control
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 clear message remains useful even when the answer is no or no answer arrives.