I am just starting my 3rd week post-op. I was having more frequent headaches and found taking Tylenol helps with some of them. I take the adult liquid version. I also feel like I was falling behind at the liquid and Protein amounts needed so I actually spent the money and got Healthwise Cappuccino, hot chocolate and a Soup variety pack, as well as the Isopure clear drinks. I try a shake every few days and do better at getting them down now. I only have to do those if my protein for the day is not quite high enough. The Healthwise drinks and Soups are 14 to 15 grams per cup. It says to mix with 6 to 8oz of hot Water and I use 6oz. More grams, less ounces to get down. It has been a life saver for me personally. The headaches are not as frequent so I do feel the liquid and protein deficiency had a little to do with the ones I was getting.
I wish you the best of luck!! Hang in there, we will get through it