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When you are not able to concentrate on the game then of course there is no need to get involved there. Since your money is slowly coming back then of course you need to rest, if you gamble strategically then of course you can win in gambling and not lose money. Basically you free yourself from addiction, it is better to gamble three to four days a week.
Whenever you focus more on gambling then immediately your money will go to someone else's portfolio, you can never gamble against your will. You are returning the money because of your excitement, I think it is most important for you to rest.
In slot games, everything is pure random. You can win or lose even if play strategically since each bet is independent so there’s no strategy you can apply to increase your winning percentage.
All you can do is to rely on your luck and manage your bankroll properly so that you will not over committed on playing slot games that will give you huge loss once you encounter no winning at all despite playing many spin.
So you’re right on your first suggestion that you should stop if you already can’t concentrate on the game.