Hi there Sunflower.

You are hiding so well, that your family did not know in how much anguish and pain you were in that you tried kill yourself. So they want to watch you, well, they wiffed once, and don't know what they should do. They are just scared.
Grumble away though, it's ok. Tell them even how irritating it is to be babysat. If they know you won't hide everything from them maybe they will relax and give you your privacy.
As to your work they would be crazy to think you're crazy. This ain't crazy. Crazy is someone who comes to work with a cat on her head. You are hurting, that's quite different.
If you were my co-worker I would wanna hug you, and ask your forgiveness that I did not see what you're going through and did nothing to help you, not look at you like a loonie.
You are brave to try to carry such a burden alone, so alone, and put up such a front.
Give them a try at work. You don't really know what's gonna happen.