An injury can not cause degenerative disc disease, but the injury can activate the DDD to cause symptoms that you didn't have before.

A compression fracture that is untreated can cause instability in the spine and further vertebral fractures to occur.
It can also cause spinal stenosis, neurological symptoms because of pressure being placed on the nerves in the spine.

Your symptoms of "constant pain in lower and middle back, urine leakage, electrical shocks from hips to feet are all serious symptoms of lumbar spinal stenosis.

If you have an untreated vertebral compression fracture, that is even more serious.

The fact that you don't have full control of your bladder is a serious emergency situation that needs medical care ASAP.

Have you seen or been seeing a spinal surgeon?

I would suggest that if you have been you call that spine surgeon ASAP and inform the spinal surgeon about some loss of bladder control.

If you aren't seeing a spinal surgeon now, you should go to the emergency room right away. The loss of bladder control is called cauda equina and can result in permanent loss of bladder control very quickly.
It requires surgery right away to get the compression off the nerves in your lumbar spine.

Please seek treatment ASAP.

Fran