I have no idea what, a pinched nerve maybe, but the pain is excruciating until I get to sit or prone position I don't plan on disturbing for a while
I'll give it another day or two before I panic
But panic is next on the list
Sorry to hear about your back. The first time mine did that it was a herniated disc (had an MRI). Now when my back goes out I use ice packs and heating pads,aspirin. Usually better in about 4 days. Hope you feel better soon.