I'm sorry.
I had bad back pain with one of my pregnancies, and not with the other three. I wonder if it's just the baby was laying or what. Warm baths, massages, walks, and swimming helped me feel better. Even though I felt like laying around, sitting or laying on really soft surfaces like the couch made it hurt worse.
As for the BH I've just noticed this week that mine are getting uncomfortable too. Not painful yet, but I am really feeling them now! I hope yours are harmless.