It could be different for other people, though. However, gambling while bearing a negative feeling is not good. Negative feeling equates to bad luck.
This is just a superstitious believe by some gamblers because it's not totally true that when you have a negative feelings it will affect your luck, these luck in question happens randomly irrespective of how someone is feeling but being anxious is just like a natural feeling that some people have when they go gambling because they are scared off losing.
I don't know how many times positive energy has made us to make money from betting which is something I am still contemplating about. Bad or good vibes or energy as a gambler does not influence our results and I hope people would understand this and not think like it is the reality of life.
We need to be very careful and think when making decisions and it wouldn't make a sense when we always think that the reason for our loses is because of the energy we are carrying to bet. Whatsoever energy that is accompanying us, if we are going to make money from gambling whatever luck or vibes cannot stop it.