If you had a hard time controling it in the past, then most likely you will again. You need to think about how you were when you were on it and the things you did. You already said yourself that you were a mess on it. So there really shouldnt be anything to think about. Its either A) I will try it, and cross my fingers that it wont get outta control again (very likely it will if it did in the past) or B) just stay away and stick with weed and not be the big mess you were three years ago. The choice is your babe and non of us can make it for you. In my opinion I would say not a good idea, but there again its just my opinion and you are the one makin the decisions. So think about it and make the right one for you. Your the only person that knows that best for yourself .