Urgent electrical help please!!

I was in the garage and stumbled. I put my hand out to stop myself and pressed the yellow button on the fuse box. Everything went off and the black switch to the right of it went to the off position. I now can’t get it to go back to the on position. It will flick up but comes back down. All the lights work in the house but none of the sockets. I’m now going to unplug everything and try it again to see if that helps. Any other advice is appreciated.

Why do these things always happen on a Sunday?

Thanks in advance.
David