I get the same with certain noise. usually chewing or licking noises (from my dog) and sometimes other noises become to hard to block out or ignore. While I have been diagnosed as an Aspie I have many of the traits as I Schizoid Personality disorder, Alexithymia and Bipolar II.

I didn't realize it was called a meltdown. I've always called it sensory overload. When I'm like this these noise cause almost a physical pain and my only option is to remove myself as I go into an almost instant rage. I'll have to try and pay attention next time to see if I'm doing any stimming to sooth myself.