Extreme back pain... possible causes?

Muscle spasms? I had this and thought for sure I was having a heart attack. Emergency room. Nothing found but I got a real nice shot of something that made me feel realllll good and more pills to take at home. 24 hours sleep and I was good to go. And started concentrating on back, shoulder and stomach exercises to support these blimps. If you must carry a big load, you must keep the surrounding structure super strong. Also work on your posture, especially when on the computer....I still slouch and pay for it.