think you need to get measured and make sure you wearing the right sizes...this happened to me b4..would feel like someone was just squeeezing my chest.... almost hard to breathe with a little pain......just make sure the bra fits right around your chest(underboobs)
I too experience the same thing depending on the style of bra I wear. I am big busted (38D). When I take my bra off it feels like an elephant sitting on my upper chest for the first 15 minutes. I do have mild asthma and take medication daily for that, I don't know if that has anything to do with it or not. Let me know what you find out. It is very annoying.
Grammie D