I also had a long labour and an emergency CS. It did take me quite awhile to get my energy back. A CS is major surgery, and with any other similar surgery you would be on bed rest for quite awhile after. But when you have a bub that doesn't necessarily happen. I think it wasn't till about 4 or 5 weeks after that I had some energy and even for a few weeks after that I needed to have naps whenever I could. Just take it easy (or as easy as you can with a newborn) and get as much rest as you can, your body has been through a major ordeal and it trying to use all its energy to recover.