If I take anything resembling Dayquil or Nyquil, my brain is filled with gray lint for up to 36 hours. It’s the closest I can get to thinking like I’m in a relapse without actually being in one.
That CAN’T be good for a person!
I took something called chlortrimeton (sp?) when I was in high school and had to sit down until it wore off. Did you ever feel like your eyeballs were doing spirals? Very peculiar stuff.