My DD knows all because she has MS. Hers is in remission and she's stopped taking all meds and is in, what I call "Therapudic Deniel".

She thinks that you can "will" illness away. I hope she can and does!!
My SSons also understand and are there for me, but I don't bring up my MS madness, unless they ask me a question about it. I do tell DD when I'm having a bad mental/physical day when I need a little attention and she gives me a loving pep talk.
My DMom had no chronic Illnesses but, was a little bit of a hypochondriac and complained of this and that..

When I told her of my MS, she went into deniel and doubted it was MS, until my hospital stay for DX...She was very caring and loving though. My Dad was dieing from colon cancer, at the time and he was very sympathetic and worried about me.