I’ve been doing carnivore for a year and have never felt better. Had no issues with bowel movements or feeling poorly - only improvements. Maybe you’re not fat adapted at all and struggled?
I’ve heard of the “keto flu” where people who aren’t adapted to ketones and have a physical addiction to carbohydrates and sugars experience flu like symptoms while they withdraw and recalibrate. Maybe that was what you experienced.
Also, I look forward to my meals. I buy very good beef and know how to cook it perfectly so my meals always turn out delicious.