Those who have that problem should seek help, and it's better if they can get away from vices that would add more problems. They need company, they need to relax, and try to enjoy life. I don't think you can find that in gambling. It's mostly stressful unless you win in the first bet, which is very rare to happen.
It is not rare, we can win very often depending on the game but winning big is rare and even rare is winning an amount that can make us rich that is how the gambling works. Anxiety can be treated and there are lot of ways and even without any psychiatric medicine is possible depending on the stage they are in. Stress and anxiety are two different things but have similar symptoms which is why they're left unnoticed.
Though there are many examples of big wins in gambling, in reality the amount of that win is relatively less. It is not difficult to get small wins. Not everyone can get rich through gambling, but they can get small wins that will create interest in gambling. Some people want to escape from mental stress through gambling, although it is possible for some, it is more of a concern for many. Because for the person who loses in gambling, that gambling becomes a matter of more concern, I don't think it can reduce mental stress until the gambler wins.