Bra causing mid back pain

Anyone else who can't wear a bra?

During my first pregnancy, I hurt my mid back muscle due to a tight bra strap. But now, 3 years later, the pain still hits me from time to time. I have changed several bras and even use bra extender but the back strap always brings back pain. I try to go braless as much As i can, and I'm at a point where I want to get rid of bras altogether.

I have been to physio and they just said it's a weak muscle. Chiro wasn't much help. I really don't know what to do.

Anyone else who's been through something similar? The future of my boobs really freaks me out!!