Hi Nida and welcome to NeuroTalk. You'll find great support in the spinal disorders forum.
I'm surprised that your doctors haven't done spinal surgery at this point. When it gets to where you can't walk and have sciatica...well, I'm just surprised. A lady where I work is having back surgery tomorrow for exactly the same reasons.
I hope you find relief soon. I completely understand your frustration with the back pain.