Upper back/Shoulder blade pain

For some years, I have had this dull achy pain on my left side of my upper back. Sometimes it tingles and aches severely. It recently has gotten much more intense.
When it gets more painful, my back tends to "pop" really frequently and when I inhale and exhale, it pops too. The pops aren't like when you would normally pop your back though, they feel like "soft" pops, but they tingle and hurt a bit when they pop.
My dad massages, and it helps a bit for awhile, but the pain comes back. It feels like there are a bunch of tight knots along my shoulder blade towards my spine.
It might be related to it, but I am double-jointed in my shoulder blade too.

I haven't the slightest clue what it is... I'm very active, exercise, stretch my body often, done yoga, nothing seems to permanently help it.