Hello, Thanks for your query. The fact that your pain is occuring with movements indicates a muscle strain. Any strained muscle when stretched gives severe pain. ,I would suggest getting this evaluated by an orthopedician for an accurate diagnosis and appropriate management. You may get the MRI of the area affected under his/her guidance. Meanwhile following measures will help with the pain • Lie on a hard bed. • Anti -inflammatory drugs like Tablet Motrin 1 tablet as and when required • Avoid forward bending. • Avoid strenuous activity & lifting heavy weights. • Apply diclofenac gel on the affected area. Warm compresses will also help. I do hope that you have found something helpful and I will be glad to answer any further query. Take care