Extreme Pain In Back, Right Of Spine, Kinda Between Shoulder

Extreme pain in back, right of spine, kinda between shoulder and waist, (closer to waist). Thought maybe pulled muscle. Seems to be getting worse the last 2 months. In the morning extremely painful, can barely get out of bed. About 10 minutes after getting up the problems lessens. During this period I have been lifting weights, abs, bicycling, walking and pitching (baseball). Now I'm starting to wonder if the pain is more internal not muscular. If I lie on the floor, can barely get up, due to severe pain, tho not bothered during physical activities. I'm a 63 yr old male, always been active.