I would suggest that the GP/Physio route is more likely to give you a decent answer than a forum.
I had a similar problem- try looking at this link http://www.fitsugar.com/latest/hip-flexor-stretch?page=2 and other stretches for the hips as I found running increases tension in the hip flexor area and the lower back then has to compensate and so also tenses up. Once I started with a range of stretches the back pain disappeared.
Also, you probably need to change your running shoes.
Weak core muscles cause my back pain when running. A physio will help you see if this is the case
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