I was told a back brace for chronic pain will "back-fire" (pun intended). It will cause more muscles to deteriorate, leading to weakness and thus more instability. HOWEVER, given your job, maybe it would indeed be a good idea to wear one just while you have to do the sitting and leaning over that hurts you. I'd ask a specialist about it.
A longer-term solution might be chiropractic plus intense physical therapy and possibly anti-inflammatory supplements or medications. Massage Therapy may also be helpful (this is not always pleasant- MT can be painful but very helpful!)
See a rheumatologist or other such specialist.
I stretch for about 25 minutes every morning for my back, shoulders, hips, legs and neck, and also do light exercises. I am in physical therapy, and do a couple bouts of aerobic exercise later in the day.
At least I am keeping my mobility.
It is important to get checked by a doctor to know what your best course of action is. A friend with pain similar to mine needs very different treatment. She needs to exercise for more prolonged periods, while that is wrong for me. Longer causes more inflammation for me (I have severe osteoarthritis with spurs on every vertebra), so I need shorter, more frequent bouts of exercise.