Overdose

A flood of seretonin, has desynthesized your receptors and to normalize this the brain is compensating by allowing you the using of four of your given senses at any given time, within the (...) switch, so if you can see, smell, taste and hear you can't feel anything.
You did exceed the dosage.
A drug just has to pass through your system. Trust me, you'll know when it's gone.