I had the same problem for years. I was lucky enough to find a chiropractor to help me get rid of it. You can not hurt yourself doing this, which makes it a good excercise for everyone.
Stand in a door way with your feet shoulder width apart, toes at the center of the threshold. Place your hands at shoulder level on the door frame next to you. (Your palms are facing the same way you are). Very gently and slowly, lean forward a few inches at a time. You are NOT going for distance. Count to 5. return to upright for 3 count. Repeat for 3-5 minutes. (You can raise or lower your hands for comfort, or to get benefit at different levels) Do this several times a day. You will not always get immediate results, but you will get relief if you do this regularly. It has worked for me for years. I use it anytime I have overdone myself. I hope this helps you. Blessed Be!