The Mirror quoted a pal as saying: "Amy started shouting, 'I need to see someone, my boobs are killing me.'
"Her manager quickly sorted a car to get her to the London Clinic. Typically, Amy made the driver stop off at Nando's for some chicken - she said she didn't want hospital food.
"The doctors ordered her to stay overnight to make sure everything was OK. She only had her breasts lifted a few days ago and she should have been resting to let them heal instead of running around town."
Winehouse, who underwent the operation last Wednesday, was spotted in a bloodshot face due to pain, before she gave backing vocals for goddaughter Dionne Bromfield in Strictly Come Dancing.
The insider added: "She was chatting to Jo Wood before going on and told her about the op and how much pain she was in.
"Everyone noticed that she looked out of time when she tried to dance. The reason was that she was in such pain she could hardly lift her arms."