If you can get stuff off ebay, I recommend kratom resin. I bought 30grams of kratom resin and finished it off in one weekend. Talk about a floating head. The stuff is wonderful. Makes walking like sliding on ice but without the slipperyness.

Low doses of DXM might also be good for you. Like half a Zicam Concentrated Cough Mist. Very much like being uber high and moderately drunk simoteneously, and you can get it OTC even as a minor. Can definately be addicting though.