Look for backstores in your community. Most people think that when they get a back strain or sprain it is due to a muscle going bad. The muscles then go into spasm for protection, so relaxing the muscles makes you feel good, but it takes away the element of protection, so you have to pay close attention not to accelerate the problem by using massage. Shiatsu would not be appropriate if the muscles are protecting a broken bone. Therapists and massage people do use elbows and use tremendous force which feels very good and can give you extended relief.
Some techniques are much lighter.
You must assign the massage to your condition. The answer to that is that this an aging process, and it can age rapidly and be quite diabling. If you suddenly went through a rapid aging of your disc, it is painful. It can even progress to breaking through the disc, and then you have a herniated or ruptured disc. You must find out what you are doing to cause it to age so rapidly.