Help! I'm in constant pain with back and hips.?

I took up Zumba in January and after 6 weeks I had to give up, as lesson progressed my back and hips would slowly seize up and pain would radiate down my leg (sciatica - i've had before). The final straw came when on the 6th week i couldn't lift my toes off the floor during the cool down. I couldn't sleep on right side for hip pain, then it spread to left and lower back. Now 6 months on, pain is constant. Popping anti-inflamitories and pain killers and still not sleeping. My back and hips are sore to the touch but also sore inside. Sometimes have pain in pelvis area and down leg into foot. Have had physio and chiropractor work on me but nothing has helped. Pins and needles and numbness now started. What is it?? Getting really down now, MRI booked for this week but know that results will take a while. Anyone got any ideas - i'm desperate.