I guess this is the classic example of meltdown process.
From what I understand, there is a process that represents the signs of extreme discomfort. It's like the "gas tank almost empty" light. I have no way to measure how much patience or brain power I have to handle some situations, but heeding the warning is a good thing. Only from years of experience do I know what I can enjoy, tolerate, and marginally endure. Crowds, noise, and chaotic activity can cause me to shutdown. If that happens, it's time to go. I suppose everyone's tolerance level is different.