JDDD and osteoarthritis

I was diagnosed with JDDD and osteoarthritis when I was 16 in the L4-L5 area. Now that I am older a continue to have multiple joint pain in my spine and hips . They also discovered that I have scholosis between my shoulder blades and a bulging disc in C3-C4. My neck has also lost it's normal curvature and has become more straight. My joints have always popped easily all over my body. They are extremely easy to pop and sometimes I have no choice but to pop them to relieve my pain. What is the cause of this at such a young age ? What is my probable prognosis ? Physical thearpy has done nothing and I'd rather not start taking pain medication. Chiropractic manipulation helped in the short term but everything went back to the way it was when I could no longer afford to go. The doctors have basically told me that this will be my problem my whole life there's nothing they can do. I feel like I need an explanation. I can't find hardly any information on the Internet concerning JDDD. Please help .