How dangerous to take propranolol unprescribed?

[corpsive]

Don't get me wrong, I am aware that self-medication is generally a no-no (unless you've been prescribed it before). I bought some propranolol for the SN method (yes, I know it isn't necessary) but I thought.. why not take some for everyday life? The ones I bought come in teeny tiny 10mgs. I have never been prescribed these before. How likely is it that I'll suddenly puke all of my organs and start to seize (my irrational paranoia speaking)?

I've taken 2 doses of 10mg before. Once a few days ago, and once right now. Been fine. Irrational paranoia is not convinced. I searched for the side-effects n' all, but there's not a lot of resources for self-medication in general. Thoughts?

 

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I've taken propanol off-script for anxiety symptoms (racing heartbeat, shaky hands). It's your own choice of course but it's generally a pretty safe medicine. I never had any issues with it and found it a benefit.