Green Tea, caffeine, ephedrine and other natural stimulants or fat burning substances (try HellFire) burner and make a research on what it contains, than there are things like amfebutamone, phentermine, amphetamines and the king of amphs, methamphetamine but i warn you, IF u binge on meth than dont overeat when u Come down. I advice you Green Tea, some burner and walking walking as much as u can, or doing other physical activities if your health is ok. I have the same problem, i am fat from doing opioids (currently tramadol and odsmt) but dihydrocodein, oxycodeine, morphine and in the past smoking powdered hydromorfon.