You should not have been given Ketamine without first receiving a benzodiazepine, usually midazolam. The benzo is to cause enough “amnesia” so that you don’t remember the bad stuff about the ketamine and have “flashbacks”.

Ketamine is a great drug, but it is related to PCP and should never be given without a benzo pretreatment. Lots of guys in Vietnam got it and had really bad experiences and after-effects before people figured this out.