Extreme lower back pain? It's spread across my lower back and no matter the position it doesn't…

Extreme lower back pain? It's spread across my lower back and no matter the position it doesn't improve. I feel like I'm being squeezed back there. I've had back pain but this one is unbearable and it came out of no where. I've been lying around all day today too. Normal? I'm a bit crampy in the front but 98% of the pain is in my lower back.