What kind of experience is it that the more anxious you are, the less you can receive SMS verification code?

The more anxious you are, the less you can get the verification code of SMS. It is a very annoying and sad experience, because I can't get the verification code of SMS, and I am still anxious, so I am even more anxious. This feeling is very unhappy and sad. So when we can't receive the SMS verification code, we still have to control our emotions, because the more anxious we are, the more irritable we will be.