Ah yes, keto flu - the worst part of going Zero Carb. Despite the name, it's not necessarily a ketogenic diet, as just eating meat is often higher in protein (as you would know). But many in the community I was in were following it in a ketogenic way by using fatty cuts of meat or adding extra fats. Many people came from a ketogenic diet with low carb veg, and were surprised that they had to adapt again when cutting out the last of the plants. Glad to hear it's working well for you, and I hope that continues.