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you should always get these things checked out. often things like this turn out to be benign, but i wouldn't take that risk.
i'm living proof of how true your post is. i was fapping 2-3 three times a day, but when i managed to properly put pmo to one side it literally...
the flatline thing irked me too, i thought i'd broke my body at first. i think i've recently been rising out of it, but for a while nothing could...