hypermentalate
(a portmanteau of mental hyperventilate) To be overcome by an unstoppable flood of rapid, incoherent thoughts. Often leads to one of two verbal reactions: random babbling or frustrated, gape-mouthed silence.
When the company president greeted her in the elevator, Hillary hypermentalated for the entire length of the 39-floor ride.
Hypermentalation
The anxious-hyper feeling one has when 'thinking' about something for too long.
I kept thinking about a solution to the question and all of a sudden, I started into 'Hypermentalation'!!