Why did my period come back after surgery ? And how long will it last?

Hello and thank you for your question. It definitely does sound interesting as your body being under a stressful condition can make your cyclical monthly event take place more often than normal. If you are able to attempt to relax in hopes of everything coming back to normal there would hopefully be the results of your doctor and that it will happen on its own. However, I do agree with the others in the fact that if this continues much longer there would be a good reason to see your gynecologist with the question. Best of luck!

Menstrual cycles can become irregular at times of stress, from surgery and anesthesia. It should not be a problem. If concerned, please visit your gynecologist. 

I have not had this happen with any of my clients that I know of. It sounds hormonal and could se a sign of stress. However, I would seek a consultation with your OBGYN to address it. 

Stress from surgery, medications, and healing can all impact your normal menstrual flow. If it does not return to normal visit with your gynecologist for an evaluation.