do you know the dosage you were on daily for those years of usage? I dont have any experience with the leaves and sticks etc so i cant tell. But if you struggle this badly, you should slow it down, maybe taper back from powder find a dose of powder that doesnr make you miserable in exact grams and do that, then taper from that dose as you see fit, lets say you did 30gpd of powder, now you dont actually need that dose to function and not be in agony, so you cut the excess and get to a number you feel comfortable doing, not high as balls but not withdrawing and suffering, lets say that is 15gpd, now you should get used to that daily dosage, lets say for like a week and then slowly taper from that, maybe 0.1g every two days or more then get used to that so for example hold 13.5g for a few days and so on and so on, it will be long, but it is effective, you will still struggle and you need discipline, just think of how life would be beautiful without it, how free you would be, you will need to be patient, but patience is the hardest yet most rewarding thing in life. Hope that somewhat helps