It's a way of showing you're very frustrated. The image is of you being so upset that you're banging your head on the wall because you can't think of anything else to do.
The head person.
If your head is "in the clouds," you're a dreamer.
Stay calm
An idiom is something that does not mean what the phrase says literally, so yes. You can't actually laugh your head off.
A hot head is someone who loses control of their anger easily.
Nothing. Perhaps you are thinking of beating around the bush, which means to avoid the topic of conversation.
It means to get to business. Stop beating around the bush and do what needs to be done.
The idiom usually refers to a suggestion against which many arguments were presented.
"Dive in head first" is to rush into a situation without thinking.
Keep an idea in ones head to act on it later.
To turn completely around and head back in the direction you came from.
That means you reacted to something negative without thinking first.