Thanks for using ask a doctor s service from doctor spring. I understand your problem and will try to answer to the best possible. The pain you are describing is probably due to a sprain sustained during the fall. Following which activities like running or bending forward is painful. During the fall, the entire body weight has been centered over L1 TO L5.
The spine extends from L1 to L 5 and then attaches to the sacrum. The weight of the body is evenly transmitted through this way. As the x ray and CT was normal, I would suggest you a few remedies:
a) To take some rest and avoid lifting heavy objects
b) Physiotherapy is also effective in relieving pain and strengthening the back muscles.
c) Use painkillers to relieve the pain for a week.
If the pain has not subsided then you could consult your doctor. Hope this helps. If you have any further queries you can always drop me a mail.