Hi Dennis,
Sorry to hear that you are feeling so bad on the Fentenyl!
I don't have any experiences with the med at all but agree with what the others have said; you really need to call your doctor and ask what he/she suggests you do as you shouldn't have to be dealing with all of this!!
I'd stop taking the med if I was you and call your doctor as soon as you can. I'm not sure if any withdrawal symptoms are involved with the med so obviously read the packet or on the internet to see what it suggests you do first! I've had a nasty time with withdrawal symptoms so it's really important you do it correctly if there could be any involved!
Take care and please keep us posted - sorry I cant help you that much, just know that you are in my thoughts! I hope you feel better real soon!