I know how bad this can be. Medications don't seem to have any effect.
Have you tried muscle relaxants? I really think that this is the key as there is so much inflammation that muscle tension builds, and pain relievers don't stop that happening. You can get over-the-counter muscle relaxants. Take a strong dose, along with a pain killer, and lie down so that your muscles can start to relax.
When i get this one it lasts all day because I am still doing things (very little, then back to bed). if at night, I bomb myself out so that I sleep and let the body relax.
so I think it is a lot of muscle tension that is causing the pain that won't go.