What kind of punishments do you mete out to yourself for your grammar errors?

As far as feeling a drop after a high, such as masturbation, that's normal. How much you drop or think you drop depends a lot on how high you went and how large your ordinary mood swings tend to be.

I experience any post orgasmic high, self induced or not, as a mild disappointment that the event is over, albeit only temporaritly. If I were worried, I might positively feed that disappointment back unto itself until it seemed a total emotional drop.

Endorphin and adrenalin highs too, create lows as they fade.

Some of us, (perhaps mostly men,) often let the low drop us off to sleep, when our time, we are told, would be better spent cuddling.

Bottom line... I wouldn't worry about it. You might find this drop to be extremely mild in comparison, once you let an experienced sadist work you over for a couple of hours... ;(