Actually it is quite simple if you want to know how to avoid stress when gambling, namely stop gambling (that's all but most find it difficult to admit because they always want to involve gambling in it).
What you do by watching a movie is one of the most effective diversion ideas, especially for those who like action movies or adventures with a season that can reach 20 episodes. That is very suitable because you will be busy with a long duration until you don't have free time to gamble. Because based on experience, the thing that can best help you get out of the stress of gambling is to have other activities outside of gambling.
Their are many factors to consider but based on your statement, I think I'll ponder more on losing streaks, it cause stress and overthinking especially when one is chasing loses and yet to recover what they've spent while trying to recover a particular lose that lead to another, such situation makes it quite difficult for lots of gamblers to quiet and mostly lead to addiction but the best way asides seeking therapeutic help is totally letting go of the lose.
You're absolutely right, I'm impressed with your statement on the second paragraph and I believe that's one of the best advise a therapist would insist, when letting go of gambling seems difficult, the best way to handle the situation is diverting one's attention to another area for entertainment like movies, outdoor hangouts, avoiding media platforms that advertise gambling activities and most especially avoid watch sports activities for a while since it could trigger it again.