Upper chest wall tightness and always remain strained upon any activity done with left hand. Vitamin D and B12 levels are very low as detected in blood test. I'm taking Tayo 60K for vitamin D. I've started MeAxon plus two days back for B12. I lifted a big bag 10 months back and twisted by spine and that day I couldn't stand and next day I got back to normal. Not sure if that's the reason. Chest muscle strain and tightness exists at all times. Please help me recover from this problem.