Fentanyl
"I've been in chronic pain for over 10 years. Multiple neck, low back and shoulder surgeries. I'm 64years old weight 250lb, I do pool therapy as regularly as I can. I don't drink or smoke. I take tizanidine 4mg at night and currently I'm prescribed A 50 mcg and a 12 mcg patch or a total of 67 micrograms, Milan manufacture patch.  All of a sudden I stopped getting relief.  At 72 hour mark I'll change the patch and its site and all I can get is 2-4 hours of relief on a 72 hour patch. Then it's pure hell whats going on?? 
I mean zero relief. Just muscle spasms for hours on end. 

I have been on all the rest and fentanyl was the only pain medicine that worked without side effects, without any trouble. I'm devastated and just would like to know what happened"