The best advice I can give you is to seek medical help to come up with a taper program. DO NOT QUIT COLD TURKEY! It is very dangerous and can lead to death in some cases if you do. You need to taper very slowly over a long period of time.
If you gave us some more details then we could help come up with a taper program with you. There are a lot of people on here who have been there and know exactly what to do!
Yes I would agree with Secrets that you should taper down very slowly. If you go cold-turkey then it could result in seizures, coma, and even death (which is not good).