I had lumbar surgery 4 years ago in L5-S1 that failed. Since then I have had many issues with constant spasms (twitching) in piriformis and swelling in lower back. Within the past 1.5 years things have progressed and my feet swell and toes turn very purple almost black when I stand or sit. I know it’s linked somehow to my back issues because they are worse when symptoms/pain is worse. I’ve been sent to numerous docs who can’t figure it out. It’s not Raynods and I have a good pulse in my feet. Side note, several MRI’s and one Neuro reports that they see a metal fragment in my surgical bed. Likely a piece of the drill or something fragmented off. (Not uncommon but typically can flush out.) Could It possibly be by a nerve that’s causing all this and/or my body reacting negatively to it? I am miserable and can’t get any answers. One Neuro diagnosed Automic nerve dysfunction brought on by failed surgery but I have no blood pressure type issues so he didn’t sound 100% confident. All docs are shocked when they see my feet or pics but nobody knows what the heck is causing it. Closed toe shoes hurt as well.