It’s good that your muscle stiffness and tightness below the left rib cage have improved with physiotherapy, vitamins, and calcium supplements. To continue managing this, you should maintain your physiotherapy exercises and ensure adequate nutrition, but also consider consulting a specialist such as a neurologist or orthopedist to evaluate the underlying cause and prevent recurrence.

• If stiffness returns or worsens, or if you develop pain, difficulty breathing, or other new symptoms, seek medical evaluation promptly.
• Avoid self-medicating with pain relievers like Zerodol-MR (which contains a muscle relaxant and anti-inflammatory) without a doctor’s prescription, as these require careful use.
• Keep your healthcare provider informed about all supplements and treatments you are using to avoid interactions or side effects.

If you want, I can explain more about how muscle stiffness in that area might relate to underlying conditions or how to optimize your recovery. Meanwhile, please consult a specialist doctor for personalized assessment and guidance.To narrow down potential causes, we will need some more information.Please tell me your age and gender.