Who called an ambulance in case of severe poisoning? What can they hel…

Who called an ambulance in case of severe poisoning? What can they help with? At the 8th week I was lying in bed and didn't eat anything for 6-7 hours. The ambulance then didn't take me. Then I got 3 days at home according to the doctor's prescription and it became slightly easier. Now since yesterday everything started again, vomiting already uncontrollable from every half hour water. The doctor says call an ambulance, but I am afraid that they will not take me and will not help with anything.