Great topic. My husband would go into ORBIT if he knew what I was up to. He is very well aware of my physical ailments, etc. and I HATE to hide, but NOPE, I'd never tell him. He has the highest pain threshold on the planet, too.
Sometimes, the hiding gets to me and the stuff that goes along with it, i.e. making sure he doesn't see my cc bills, etc. It's tough, but I've known the man I love for a LONG time and NO is the answer here.
My brother, who is a pharmacist knows and that's IT.