Tired after ACDF surgery

Please tell me how your feeling within the first year after ACDF surgery. I had c5-c6 with plate screws and cadavar bone on May 13th. My pain from neck is 90% gone but I feel so tired ALL the time since surgery. Does anyone else feel this way or know if this is normal? I was mostly energetic before the surgery but I have gained some weight also since surgery which could also be the problem.