This sounds like sciatica
, which is nerve pain
caused by pressure on the sciatic nerve
in your back (from a bulging disk in your spine -- a "slipped disk" -- or from other back injuries). The fact you are also experiencing numbness suggests to me that your sciatica is pretty severe. You should see a doctor -- physical therapy
can make a HUGE difference in this condition, and anti-inflammatories and other medications and help as well. You don't need to keep suffering!