Personally, a a bettor, I find it very stressful when watching the game you are betting especially if it will end up a losing bet.
If we have the same experience, how do you cope up with that problem, after all, gambling should be fun but why we have this kind of feeling that we feel disappointed when our bet loses?
Of course, it's always painful when we see our bets losing and we think that we should have bet the correct one. Or at least what's painful is that like in sports bet, you want to bet on the other team and then you change your mind and suddenly end up losing.
As to how we cope, I guess we should let it go and not think about it. Maybe you just have to take a walk or something, talk to your family member, at least do something that will get away your mind from that losses. And then after that, you will feel good and might go and bet the next day.