Adam,
I've used Byron Katie's 4 questions with good results. I was introduced to it via Gary Weber's blog.
He always suggests using Lester Levinson's method immediately after Katie's. Check out his post
hereAs far as "don't know mind" I found that when I notice a strong thought appear simply asking the question "How do you know that?" had a lot of power to allow me to see it as just a thought, not reality.
I really like your questions:
"Why am I doing this?"
"Am I really not free?"
I can see these being highly effective, for me at least.
Metta,
Brian.