At times when we feel we've lost some money in gambling that we can't easily accept to let go, I think the best remedy to it is to give oneself a break, to continue gambling at that point is a really big mistake the gambler is making, because not only will he or she lose more money, but he's emotion might drive him into doing something really stupid which could lead to even more loses.

I have a personal experience when I gambled and lost about 50 percent of the initial amount I budgeted, I allowed anger take over me and my emotion drove me into betting the remaining balance of 50 percent once, and in a twinkle of an eye, every thing was gone, I really felt bad that day.