I had a bad L4-L5 experience a few years ago (near fatal seizure which cause my back to collapse and etc.).

My wife is a surgical nurse who works with orthopedists. Want to know what my experience taught me that could be relevant to you? You'd be crazy to take medical advice from strangers on a bike forum. It's nice that we can share experiences, and perhaps gain some hope for recovery / treatment. But any problem with your back that causes you pain like that means you see a doctor. And not the country general practitioner type, either.