I’ve had really bad pain from day one in my left boob. A lot of pressure and stabbing pain until about 2.5 weeks, week 3 everything settled and by week 4 I was perfectly fine.
Make sure you drink lots of water, the pain will mainly be swelling that is pressing around and of course the stitches. I drank between 3-4 litres of water for 3 weeks, I wouldn’t be able to tell you how much of a positive impact it had but I wanted to give myself the best chance to get the swelling down. Have patience, I know it’s scary but unless you’re almost crying with pain even after taking painkillers, please ring your surgeon to make sure everything is ok.