Very probably muscle tenderness, spasm appeared during your work . For athletes and workers who lifting heavy weight s is common musculoskeletal injuries. In your case you may try massage
daily with warm essentials oil, heat pack, anti-inflammatory creams, avoid gym and lifting heavy weights for minimum 10 days to two weeks, anti- inflammatory and muscle relaxant
medicines per os,. If your symptoms will persist or will appear numbness
in your neck, arms and back, or any other new symptoms, you must seek Neurologist
consultation that will do assessment and will prescribe treatment.