Sorry I didn’t see your message I’m POD10 now and I’m still in a lot of pain in my right shoulder so much so I’ve been to the GP and they gave me codeine but I’m not going to take it as it doesn’t agree with me. I’m meant to be working on Saturday but I don’t think I’ll be able to because my shoulder/arm hurts so much and I can’t do with it but I’ve been assured that it shouldn’t last much longer. I’m the same as you and haven’t had much pain with my boobs and it’s all been in my back/ shoulder/ arm, even typing hurts! I’m pretty sure you’ll be fine to use a hot water bottle on your back just maybe get someone to position it for you so you aren’t stretching your arms too much