I lived with that kind of pain for years until I found a great chiropractor who suggested several stretching exercises before golf.
1. Hold onto the roof of a golf cart while pushing back from the cart.
2. I hold a club in both hands in front of me and bend forward 10 times trying to touch my feet with the club. I then twist my hips and try to bend toward each foot 10 times. I don't exactly reach my feet but I get close.
3. I hold a club behind my shoulders with both hands and twits my shoulders and waist using the club to increase resistance to the twisting.
Everyone is different and what works for one person doesn't work for everybody. Maybe this will help you.