Symptoms Following Lap

Morning I have my first Lap nearly 3 weeks ago, was told I had Endo at the back of my uterus and also in my bowel. Following surgery I was back at work on the Monday (surgery was Thursday) and I have felt terrible since. Flushes, aching all over and very lethargic. I have been given Cerazette however my period has not stopped since surgery. Any one else have this issues following surgery? My symtoms before surgery was very mild and manageable, worried now that its made things worse?