Hi there! :)
I'd agree with Jinx. Definitely taper! By all accts. Fentanyl is a rough kick. It's a fully synthetic opiate & those tend to be the worst. However, the kick from Fentanyl is not as prolonged as say M'done or Subs.
I'd be very careful of going into your kick w/ this sort of fear because it will be counter-productive & make the detox worse. Our minds are very powerful. Do you have pre-existing depression or suicidal ideation? (If so, you should talk to your Drs. before attempting this) If not, please know that there is no opiate detox that makes you feel like killing yourself as a regular symptom. Here is a thread I dug up for you. It is the only mention of suicide that I could find in relation to Fentanyl & it was here on MH:
http://www.medhelp.org/posts/Pain-Management/Withdrawal-from-fentanyl-patch/show/1245808
We've had a slew of folks come through here who have detoxed off this drug. So, if you really want off, it's doable but I'd make sure to design a wise & safe plan with your prescriber to make it as 'easy' as possible. :)