Will thorazine (chlorpromazine) make me feel crazy?

Usually the opposite: Thorazine (chlorpromazine) is one of the oldest antipsychotic medications, having been around since the 1950s. It treats symptoms of so-called 'craziness' = delusions, hallucinations, disorganized thoughts and behaviors. It has psychiatric & medical uses including: treatment of schizophrenia, bipolar disorder manic phase, agitation, nausea/vomiting, intractable hiccups, & insomnia resistant to other treatments.

Circumstances: This depends on the circumstances of using thorazine (chlorpromazine). If it's been prescribed for psychotic symptoms, agitation, &sleeplessness, i agree it could help you feel better. Low doses are sometimes used for severe nausea too. But if you've obtained this illegally -- and are just trying some for experimentation -- yes, it could be a weird experience. You'd be disturbing normal brain chemistry.