I have had that problem on DXM before.No problem puking tho,hmmm. Whats worse is methadones man.I have to sit down and like meditate to piss.I mean for christ's sake sometimes i nod out before i can start pissing.And then i have to start concentrating again.Godamn opiates.
I've found that most drugs do make your dick shrink tho. MDMA, dxm, yay, amphetamines,etc etc etc.