Ironically I was going to post a similar post. Had surgery 10/27/2015. It also takes me about an hour and a half to get Protein Shake down and another hour and a half to drink a bottle of Water. I have the headache as well but am thinking it is from anesthesia although it could be caffeine withdrawal. Still very fatigued and sore. it's getting a little better each day but wish I was a little more "back on my feet" . So are others experiencing the same?