If you mean dilaudid by dils, you are going to have a tough time tapering on those...IMO. Just take it slow, and don't take just to take (when you are low and trying to taper). Wait 'til you've started to experience uncomfortable, or in the case of your job, inhibiting, withdrawals. Always know that it is going to be tough in the beginning and get even tougher within the next 5 to 14 days, depending on what kind of opiate/opioid you are using (you say smoking fentanyl?, IDK buddy, those are usually transdermal or lingual/sublingual ROA's). Sounds nasty and dangerous... Anyway...
IF YOU ARE... Stop smoking patches!!! That is just taking stupid and pouring stupid all over it. Sorry, but you need a little kick in the rear and a lot of education.
Tips for tapering (IMO, of course):
Day 1 is very tough psychologically (long half-life)
(Or) is very tough physically (short/min half-life)
From then on, it only gets tougher or easier, depending on what you're DOC was and what ROA you used. This would allow one to determine an approximate half-life and Bioavailability, therefore allowing a starting point for a taper or a withdrawal (or a bit of both,

.
The whole multivitamin thing helps, but you're better off to get your vitamins from fresh, organic fruits veggies. Eat lots of root veggies. Sweet potato is an excellent one. Easy to make and lather with butter and salt if desired. Drink lots of water. And finally, drink lots of water.
Know you drugs, know your half-lives, and stay active and positive.
I've used pregabalin for the RLS and some diazepam for the BP and restlessness. Both helped, but both are also very addictive to some people, so be careful and see a physician
Kratom helps. But I also hear there are many good and even more
bad places to get your legal kratom (mitragyna speciosa):
Mitragyna speciosa is a psychoactive tree in the sense that the leaves of the tree have been chewed to promote an uplifting mood and to treat a large number of health problems. M. Speciosa is indigenous to Thailand and, despite growing naturally in the country, has been outlawed for 70 years due to the properties of kratom curing opium addicts and reducing the Thai government's tax revenue from Opium distribution.
--wiki
But the biggest thing is once you're not physically dependent anymore, what are you going to do with your time now? Boredom is a killer. Bad relationships are a killer. Good relationships are what make us human and can help to save any soul.
Peace Out,
C_Positive
P.S. If you can do so legally, constantly puff da ganga plant while you are getting off dopers...