1st choice solution: Take an atypical antipsychotic such as Zyprexa, Seroquel, Risperdal, or Geodon.
2nd choice solution: Take a benzodiazepine such as Xanax, Valium, Klonipin, Ativan, or Restoril.
3rd best choice solution (tie): Drink a moderate amount of alcohol OR take some Benadryl (diphenhydramine).
A combination of 1, 2, and/or 3 is also acceptable. And, finally and mostly importantly, don't take any more stimulants until you have slept this off.
Since you realize the voices are not real, you are better off than some. Good luck.