Velezpr,
I know you said this is from a spinal surgery, but it sounds like symptoms I'm having after having had a knee surgery, high tibial osteotomy. After the pain block medication wore off, my left outer, anterior, calf and left foot felt like burning pins and needles. I was driving me crazy with the pain, I couldn't sleep, wear socks have anything touch my foot/leg or it would get set off. After a couple of days of that, I spoke with the doc. Said it's not common but can happen from trauma during a surgery that a nerve gets stretched or pinched and could take a while to calm down. Doc wanted to put me on Lyrica, but I was put on Gabapentin because that's all Tri-Care would allow. After taking that for 30 days up to 1800mg a day and having no relief at all (still getting maybe only 2 hours of broken up sleep a day), doc was able to put in an appeal and get me put on the Lyrica. I noticed a change after a day on it, I'm at 300mg/day. 2 and a half months later, I'm still feeling the pain, but it has subsided significantly and I can actually do things. I know the problems still there because I missed a dose for a day while I got a refill on the prescription and the pain level was starting to go up and my attitued turned to crap.
Last meeting with him he suggested he thinks it's Reflex Sympathetic Dystrophy, or RSD. I am just now starting to do some research on it, so don't really have any info on it other than it can occur after surgery if there is trauma, edema, or damage to a nerve.