Thank you for getting in touch with us. As I make out, you have a history of lower back pain
. As you are pretty young, the chances of any serious condition are mild. But as you are having pain from the last 5 days, I would recommend you to get in touch with your GP and get it checked. He might conduct few tests to find out the exact cause. It might be just a sprain
which usually gets better with medicines. Exacerbation of the pain with change in head position indicates that there might be a sprain or stenosis which is compressing the nerves between the vertebrae. Therefore, you should get it evaluated. Hope this helped.
Dr. Gagandeep Dhillon