For me when playing those games you referring to, I ask myself can I lose this amount if the inevitable happens? The moment I am sure of that, I play then look away to look back when it finish rolling. Its simple as that so I don't have to feel my heart tapping to my throat.
Well it's probably like that for people who's stakes are too high when they play dice. Betting a huge amount on a roll, anyone would get their hearts in their throats. That doesn't happen to me though because i don't really bet huge amounts in dice especially after i lost btcs. Usually i play with minimum playable amount only and then i lose interest if i lose