I am sorry to hear about your medical problems. Osteoarthritis, DDD and DJD can all cause pinched nerves. They can even cause pressure on the spinal cord. This along with other injuries can worsen the pain.
If possible consult a sports injury center or a neurologist and a physiotherapist and chalk out a physiotherapy program to help relive the pressure on the nerves. This can be done via traction, spinal manipulation, exercises, swimming etc.
You can wear specially designed belts and corsets to support the spine. Also, the pain killers can be titrated such that you have round the clock pain support through pills and patches.
Also, at your age, hormonal analysis to rule out menopause and thyroid disorders is important as both can contribute to pain.
If all this does not help then talk to your doctor about disability status.
Hope this helps. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.