Unfortunately rape is one of the hardest things to prove. Unless action is taken immediately, and you undergo invasive testing, there's usually about 0% chance of proving he did anything. Also, the fact that you were into the drug scene and willingly took pills you had no clue as to what they were, is going against your side.
Other then that, keep trying.
I hope you have stopped with the drugs, or at least been safer about it, to avoid future situations.