I'm not inexperienced with drugs by any means and the day after I trip or do drugs I expect to feel a little off and by the 2nd day I feel normal but it has now been 3 days since I chugged only 1 bottle of robitussin and my brain still feels a little stunned. The only thing I can compare it to is when your exhausted after a long day and your mind just isn't as sharp ad normal. But I feel worse than the aftereffects of mdma. Is this normal and should I be worried?