So far I have never heard or known of doctor who advised patient to engage in gambling activities and of course doctor would only suggest more beneficial activity such as exercising, this would be very useful alternative activity.
That doctor might be a gambler himself and finds gambling activity as stress relieving activity for himself that's why he might be suggesting the patients to gamble in order to reduce stress.

In real world prolong gambling can in fact increase someone's stress levels and that's why most people recommend to gamble within limits.
Some people who get addicted to gambling often spend countless hours to place bets and if the bets turn out to be losing ones then such people get addicted and even face more stress from the activity.
Even if the gambler in my opinion there will be no doctor who advises someone to do gambling as a means of stress relief, the person will become more stressed when treating excessive gambling and certainly people who are easily stressed their emotions will be more quickly affected, it is likely that he will become a bad addict and cannot be responsible for his gambling.
Gambling will be beneficial for those who can control themselves and are able to take responsibility for their gambling, if someone is easily stressed or has such a disease, it can be said that he cannot control himself, how can he gamble and relieve stress if he cannot control himself even if he is forced to gamble, I think it will have more adverse effects on the patient such as impulsive and compulsive addicts.
Actually we dont really need up any advises or any professional help if we are really that serious on quitting gambling. It is really just that on someones seriousness on how they would really be quitting up
on which addiction could really be treat on your own way as long you would really be that serious on quitting and not really that just having those temporal feeling or emotions on quitting on that point only
then you would really be able to quit up on your own without needing much action or any further help if you are really just that serious on quitting but if not then it would be over for you.
At first then you should really be that responsible on what you are doing specially with gambling on which it is really that getting involved with spending money and if you arent that good when it comes
self control and emotions then you would really be ending up miserable.
It can be considered right and can also be considered wrong about your opinion, basically humans have differences and some of them need guidance or need to be supervised continuously at a certain level of addiction, just like a disease, where some diseases you can cure yourself without the need to see a doctor and there are some diseases that you have to follow the treatment of a doctor.
People who are severely addicted will not be able to take responsibility for themselves in gambling, in other words, they cannot control themselves because of acute addiction.