What happens after taking 20 Coricidin HBP Cough and Cold pills?

on saturday, i took 20 coricidin hbp cough and cold pills for the first time, and i vomitted a lot saturday, and i went to the hospital. yesterday, i felt a little bit better but i just felt a bit nauseous. today, i felt nauseous also. i tried eating crackers and drink ginger ale. i felt better for a while, but the nausea came back again. what should i do? and also, how long do the pills stay in the system for?