I met a friend who used about $1 to play gamble to win about $2500 in a game of different matches, all the early games went well but the last game cut which made him loose the game. This lose made him to be sick for 3 days, the reason for his reaction was not because of the money he used to bet but he felt so bad because he has already put all his hope on the money he would have won.
When you are really not mentally ready, stay away from gambling. Because, this can really make you not only sick physically but also mentally, experiencing various forms of depression and prolonged stress, which of course will also have a bad impact on your overall health.
And maybe your friend is just one of the many people who also have the same problem when losing money in gambling. When reality really doesn't match expectations, even though we have very high hopes, are really gambling to get money, and imagine buying or doing something with that money, but in fact, it's all not real. And this is what often hurts many people when they lose in gambling.
What your friend feels is normal reaction in the face of failure and disappointment. It is all part of our makeup as human beings when we face disappointment we are angry we lose appetite we depressed and it is fine.
This might just be fine when he gets support from many people around him and also he really realizes that he can get very valuable learning from this. However, if he cannot manage his emotions and mentality, it will be very difficult for him to be able to move on and return to normal. Indeed, in this case, support from those closest to you is really needed to strengthen your mentality and refresh your thinking.