We all have different levels of anxiety. Some of us can't sleep all night knowing that tomorrow something will happen, even something not very important, and some of us are engaged in illegal activities, cheat and kill people and still sleep well. It is quite possible that OP has a high level of anxiety, so I would recommend him to be examined. If the examination shows that his anxiety level is high, it can be reduced by medication. If it happens only when gambling, he can try to reduce his bet.
If we are talking about strong medications that reduce anxiety, this may not be a good way out of the situation either, medications with the same effect are given to dementia patients, and this only complicates the problem at a distance. With strong drugs you need to be careful, pharmaceuticals it is different, can and somewhere wrong to lead a person in the end, on the contrary, have a negative effect. But there are also sedatives based on natural components, this is a more suitable option. I would recommend minimizing situations that excite a person. That is, if you are sure that this is what irritates you, it is better to localize it.