Having Back Pain, Hurts When Stretched. What Causes To Have This Sort Of Pain?
Sorry to hear about your problem. Judging by the location and nature of your pain, it looks like you are suffering from either a back muscle spasm or a herniated disc. Both these condition can cause the pain you are describing. It is not due to any organ but due to the disc pressing on the nerves.
You need to take rest for a few days and consult a neurologist or an orthopedic doctor. They will order an MRI of the spine to assess the condition and start you on some strong pain killers and muscle relaxants. After a few days, you can start physiotherapy and back strengthening exercises, which will help in recurrence of the symptoms.
It is better that you get yourself evaluated by a doctor otherwise this condition can worsen in the future.
Hoping for the best. Please feel free to clarify any other query.