It seems from reading all these posts, that each person is handeling it in their own way, as they feel is best.
I would not share a dx with a co-worker. To me that would be too personal. My thoughts are that sharing with a co-worker, would take it from personal, to public. However, I would say that I was feeling down on a particular day, and not wanting to talk about it in detail.
Telling people your "not feeling as chipper as usual", somehow helps them understand you, and not misunderstand you.
I wish you the best at this, as it is a hard decision, and one that each of us think about from time to time. Try to remember too, that it may be hard on some family memebers to know you do not feel well.
Good Luck and Best Wishes,
Colors