When choosing the date for your cosmetic surgery, it is important to plan for a sufficiently long recovery period after the procedure. Breast augmentation is a real surgery - with the possible related risks and consequences, including pain or scarring. And just like any other surgery, your body needs to heal afterwards.
You may not feel well immediately after the operation. That is a normal response and is primarily caused by the remaining effects of the anaesthesia. The important thing is to give your body time to heal.
Do not try to speed up the healing process. This is critical in any kind of surgery.