20 days post op, shoulder blade pain after Breast Augmentation. I'm 42 yrs old asian w/ 360-375cc sub. Any suggestion? (photo)

After BA, I found myself using shoulder to support my chest and ended up severe pain around shoulder blades. I have terrible fatigue and the shoulder pain prevents me from doing desk work till day 20 post ops. Any remedies? I want to correct my posture but I feel like the breasts are dropping off my chest. Can posture brace be worn at this stage? Will it break incision or cause any harm?