I had an mri - says l4-l5- disc buldge with superimposed central disc protusion. severe spinal canal stenosis with compression of the thecal sac with bilateral neurofarminal narrowing. a chair broke and i collapsed on back. ?

Pinched nerve: Spinal stenosis is one way to say you have a narrowing or "pinching" of your nerve canal, in your case it is severe. The cause of the pinching is at least in part from a disc protruding into the nerve canal (herniated disc) which could potentially have occurred in the injury on the chair. I would not hesitate to be seen, many good treatment options available.