Noone here is qualified to give you medical advice. If you suspectmyou may be experiencing an overdose or serious drug interaction call 911.
Diazepam does influence the probability of death, duration, severity, and number of seizures after exposure to many poisons and drugs.
However, diazepam is not effective in many drug poisonings and can make it much worse.
Without any idea what four drugs you took, your prior medical history, or your vitals which is one reason a hospital can save your life.
Doctors at the hospital cam get real time feedback of whatbyour current statenis and how it responds to treatment and have a iv lead in to deliver instant interventions in the case of crisis