I completely know how you feel, Keith. I wish it were possibly to have some sort of rewind button so we could use our more learned selves now to advise our former selves to prevent bad things from happening. I know this is easier said than done, but it's really best to try not to think about the "could have beens".
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I'm a bit of a hypocrite here because I do still from time to time kick myself for perhaps not being as careful with the noise or what I was putting in or doing to my body, but until a time machine comes around, there's nothing I can do to change that besides improving myself in the present and future as best I can.
Unless figuring out exactly what you did will lead to action (and, in turn, results) then there's nothing to be gained. You're a lot more informed now and that will hopefully prevent any further problems or damage going forward.