Same here, 14 years lifting, suddenly I had to be in bed for back pain for a week. After that I spent 4 years with backpain and stopped training following the advise of various doctors. Met a guy who does power lifting, we became friends, he is also a phisio and told me to gradually go back to the gym, pain almost disappeared after 6 months. Now I am almost back to lifts I used to do 20 years ago, but I manage pain actively and avoid overdoing it. Most doctors don’t train and don’t understand how mind/body works. Sometimes pain is not linked to a “real” physical problem, then you do MRIs, talk to doctors, and they find a problem somewhere, they always do, but it could have nothing to do with the pain.