Honestly forgetting about a loss is hard especially a loss that happens after you've chased a loss. More reason why you should not gamble irresponsibly. My estimation um if you are is all it takes for me to forget about a loss and to do this I always stay busy, that is a trick. If you don't give your mind something to think about and your hands something to do your mind would always ruminate over the loss and it is absolutely, pointless. Stay busy.
It's hard to forget about a loss when you gamble with huge amounts and end up losing it. I don't think I've had moments when I started thinking too much about what I lost because I always gamble responsibly. Gamblers put themselves in that mental stress, gambling is something that should not give anyone such torment emotionally. Just put a few coins in it and accept whatever outcomes you get from it