Yes, the thought of that whack on your head is enough to make me wince, even now. You've been through the grinder LNM, you really have.
I'm, like the others, delighted that you're off work for the moment. It doesn't sound like a supportive environment at all. At the very least, you should be able to go to work and be busy enough to get distraction from your emotions for a while, but it sounds like your job is another factor that's causing you grief.
Hold tight for the next few days. I think we can all see how you've 'fought' these last 14 days or so, and by God, you've blown us all away with your resolve, but you're drained now. You really 'sound' it. Take the next few days to get well from the knock on your head, gather some strength, and maybe think about putting feelers out for another place of work.
In the meantime, keep talking to us. We're all holding your hand.