I suggested checking the mezuzos because, when it comes to health matters, we take every precaution.

My father-in-law, who was a nasi and a tzadik, had the ability to make promises that Hashem would fulfill, as He honors the decrees of a tzadik. All letters addressed to me are opened solely by me, and my responses are dictated word for word. https://www.torahrecordings.com/rebbe/igroskodesh/011/010/3637