hello i read your question and understand your concern yes, you have to go as early as possible to check with your family doctor as in my opinion and according to your symptoms you have got your back muscle pulled/sprain or might be a disc prolapse due to sudden weight lifting i would also like to ask that * is there any sound when this pain happened * your age is? * any disease you are having specially related to your bones i would suggest to have one x-ray lumbo sacral spine AP & LAT done and also check you s.calcium and vit D levels and take Muscle relaxants and strong pain killers/anti inflammatory medicines and take rest,avoid to lift heavy objects, try to sit with back support i hope my answer will satisfy you good luck & tc