Thanks for your question.
This could be a serious sign. I think you should see a Neurologist
first. The doctor will examine you & may order some relevant tests like X-ray, CT scan
or even MRI
to ensure the health & integrity of your back bone & spinal cord
. They will refer you to the concerned physician if required. You should avoid exercises that put strain to your back bone till it is proven harmless.
Wish you good health.