I haven't tried Botox for CDH but there is some evidence that some
people can get some relief. You'd have to find a pain doctor that has
experience with Botox injections to get someone that knows what they are
doing.
Like the other treatments you've tried it may or may not work. Heaches
in general are hard to treat because there are a number of causes and
there is no diagnostic tests. Headache is only now getting some decent
research because CDH doesn't kill or outwardly maim If you did find a
pain doctor that works with Botox chances are that you'd end with some
other treatments as well. Then again, you may be one of the few that get
great results.