Fun topic...
I've oded on antidepressants,sleeping pills, antipsychotics ,dph,dxm,cocaine,and heroin.
Technically I oded on thc but it was only so bad because of the amount and how much alcohol I had consumed with it.
For me when I od its either I'm not breathing at all , I'm unconscious, I'm having back to back seizures or I'm puking my guts out.
The ones that hurt the most are the seizure odes because you're so confused and scared because your brain literally feels like it's being fried.