I've been on the Duragesic 100 patch for over 18 years without problems. However now when I put on a new patch I'm not getting any medicine & am experiencing terrible withdrawal symptoms & severe breakthrough pain. I'm just wanting to know if anyone has been on Duragesic for as long as I have & if so how many years has it worked for you? Also if anyone recently experienced my same problems with the Duragesic 100 can you let me know? Please explain if possible. Thanks.