Palpitations while listening + am I supposed to hear 20 kHz tones?

[Shannon]

Thank you both, @Shannon and @fab10

Shannon, I do feel I have been having some resistance lately in the form of excessive weed smoking. I've resolved to quit until I complete my minimum 32 days of listening and see what happens.

If you are seeing that smoking weed is a form of resistance for you, then it is something you are using as an escape mechanism.  All forms of addiction result from seeking to escape either fear or pain or both.  This is a red flag that you should resolve to stop using it at all, and instead focus on overcoming the fears that are triggering it.  Escape mechanisms are only useful for hiding from hat helps you grow and become better.  Deny them, and you are left with growth and self improvement being the only options.