Hey
@Legitjohn 
First off, major kudos for getting off of the Fentanyl. That is huge. Make sure you give yourself credit for that.
Opioids were my drug of choice, so we probably have had a lot of similar experiences. I lived in Cambodia for a while when I was teaching and I had essentially unlimited Heroin for the first time in my life. I could use as much as I wanted and still eat and pay the rent. I got to a point where I was using 3-4g of relatively pure Heroin every day, intravenously. All I felt was numb. I didn't feel good, bad or anything. There was no color, emotion or anything.
I was using higher and higher quantities trying to break through this wall. It only made me feel more numb. I eventually felt trapped. I came to the realization that the only two options were to reduce my tolerance or to keep feeling nothing. I ended up reducing the dosage on my own volition. The only way I would be able to enjoy Opioids again would be to unsaturate my body and mind.
I eventually got to a point where I was using ~1.5g Heroin per day. This is still on the far end in terms of the maximum amount I could use and still receive benefit. I'm pretty sure that if I were to make all of the right decisions, my optimum dosage would be ~500mg - 750mg pure Heroin per day, perhaps even less. You have to find a sweet spot.
Your mind is going to tell you from experience that the solution to any problem in life is to use more Opioids. You need to get that out of your head.
If you're looking for a return to that warm rush, positive effects and good feelings, you will need to reduce your tolerance. This doesn't have to be painful or miserable. The large quantities you're trying to use right now aren't making you feel better anyway, they're just going to waste.
I'm not sure what best works for you. You can either reduce each dosage without changing your frequency. You can also do stuff like "On Wednesday, I'm only going to do 2 shots instead of 3. Whatever works best for you, find ways to reduce your tolerance. Once you are at this wall, there isn't a viable way of getting the effects you want from Opioids. You can potentially use enough Fentanyl to sedate you/knock you out, but I think you'll agree that this experience is far from the desired experience from an Opioid, like the experiences you remember.
With your Hydromorphone (Dilaudid) literally by the handful, you know you have access to something that many of us around the developed world can only dream of. For a lot of folks, Hydromorphone is their favorite Opioid (it's my number 2). I'm not saying you're ungrateful, just reminding you to be grateful. It's easy for us to become complacent and forget what we've got.
If you do the leg work, reduce your tolerance at a comfortable but consistent rate, you could have access to the holy grail of Opioids, in huge quantities for the foreseeable future. To start using Fentanyl when Hydromorphone is available is like punching God in his testicles or her titties respectively. It really is that bad dude.