I know bluff don't usually work as I myself lose from time to time. And if I think the pot size bet is something I can afford to lose, I give it a go.
Often times I don't succeed with it, maybe once, twice and the rest is failure. Did you notice that you lose more when you got upset when your bluff or hero call didn't work? should you take a break when this happen?
well for sure you will lose more when you get upset in general , you should kill your feelings before starting your session
being upset due something else like family problems will make your decisions usually bad also you will lose your focus sometimes
my point is try to kill your feelings when you want to grind or let poker wait till the other day