I suggest you go to your doctor and get your back evaluated. It may be a disc problem that causing irritation to a nerve. I suffer from sciatica and the pain your describing is similar to the pain I feel. I have pain in my lower back (especailly when sitttng or lying down), buttock area, radiating out towards my hip and down my leg. My leg also goes numb at times or I get pins and needles type tingling sensations. My first three toes on my foot also go numb. I think having a doctor look at it sooner rather than later would be best.
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