I fractured my coccyx and lower and upper sacrum in 2009 after a fall. I have SLE (active sporadically) and hypermobility syndrome (9 or 10 depending on Brighton or Beigton scale, but maximum for both). I am on naproxen, methotrexate and fentanyl patches. I am employed but still find sitting produces pins and needles in my feet after sitting for more than half and hour. I have a chair at work with coccyx cut out and raised cushions but don t understand why I get this painful condition?