Hi.
I too have had hot poker sticks coming from my tailbone to my lower back. Hurts so much I almost crumple to the ground. Happens several times a week. I have failed back surgery and developed an autoimmune disease after having a spinal fusion at the L5-S1. I have tried most every type of traditional and non traditional therapies with no luck until I read about and tried MFR, or Myofascial Release Therapy. This has pretty much stopped the stabbing poking feeling and pain. I still have to take meds for my various ailments, but this MFR has helped me to the point where I have less neuropathy in my feet, and my body is in a much more relaxed state and my pain is diminished for days at a time. I have had 8 sessions so far and 4 more lined up so she can work different parts of my body where the fascia is tight.
I strongly suggest trying this therapy of MFR. also what helps me is I do my morning walk, then I put my legs up the wall in an L shape, which helps stretch your hamstrings, and legs up allows your blood flow and fluid to drain down and provide relief from the gravity used to from the pressure of fluid buildup. Then I do self treatment of MFR which helps as well. It has given me a new lease on life being able to actually be myself and not be so caught up in my ailments.
Research who is trained and certified to do MFR. massage therapists might say they do, but please made sure they are trained and certified in this area
Good luck and hope this helps.