Obstructions and blockages can be caused by scar tissue after surgery, by intestinal swelling, and by kinking or twisting of the intestine. My blockages after surgery were all due to swelling and scar tissue. I was told I had a lot of swelling after surgery and it took a while to subside. One of my surgeons said my bowels just "blew up" with swelling after being cut. Believe it or not 14 months after takedown isn't that long. And it really took a long time for my bowels to settle after the colectomy.
Of course, it could be something you ate coupled with a physical issue. But I would tend to not suspect the stricture. Also, if you were blocked at the stricture, you would be feeling lots of pain and pressure.
I am just speculating of course, based on my own experience. BTW, you were smart to refuse the fentanyl and it was not a great idea by the ER staff to offer it to a patient who couldn't move his bowels. That definitely would have been pouring gasoline on the fire.
Not sure what to make of the gurgling. Let us know if you have a BM tonight. Try having some soup or tea and see if you can keep it down. Liquids until you move your bowels.