[popschedule]

I do the same thing when I over-think. It's overload and background noise in my head. I go through a couple waves every year with very bad panic attacks for a few good weeks, usually triggered by stress. I notice it's when I have a hunch to do something but then delay on it for a few minutes/hours/etc. starts as a restless feeling which then leads to dervish behavior then thoughts directed internally... leading to hyper ventilation, heart palpitations, etc. Good advice I'll have to try that next time.