One day is not enough time to adapt to a major dietary modification. I’d suggest giving any change at least a week or two, but preferably a month, before deciding if you can tolerate it or not.
And try out CR and IF independently, don’t jump into both at the same time.
ETA: If you go more than a week on IF and you still feel terrible, you (like most people, sadly) have larger metabolic issues to resolve first. So switching to a Weston A. Price traditional/paleo-ish or Perfect Health Diet setup, getting your health up a few levels, and then trying IF after that.
One day is not enough time to adapt to a major dietary modification. I’d suggest giving any change at least a week or two, but preferably a month, before deciding if you can tolerate it or not.
And try out CR and IF independently, don’t jump into both at the same time.
ETA: If you go more than a week on IF and you still feel terrible, you (like most people, sadly) have larger metabolic issues to resolve first. So switching to a Weston A. Price traditional/paleo-ish or Perfect Health Diet setup, getting your health up a few levels, and then trying IF after that.