What is degenerative joint disease in your back, sacroilitis, and SI joint? Will taking an joint injections help easy the pain?

DJD. Degenerative joint disease is usually an aging process an d occurs by constant use. If you have this diagnosis at your age you should see a doctor .
Arthritis. Degenerative joint disease or DJD is just another way to say osteoarthritis which is the most common form of arthritis. Rheumatoid arthritis is a less common form but can be even more debilitating & deforming, while osteoarthritis is just painful. Anti-inflammatories such as your Advil (ibuprofen) are a good start. Acetaminophen is used too as it doesn't affect stomach or kidneys, unlike NSAIDs.