I have been eating more than 1 month as healthy as possible, without gluten, little sugar, little salt .. lots of vegetables, meats, fish, nuts ... to me this way of life I do not like or feel better, ..
Maybe you changed too fast, and expect feeling things not possible?
In my case I gradually changed my diet when I got a diagnosis (PAD) where conventional medicine didn't had much to offer. Instead the diagnosing Internist was even of the mistaken opinion, that how much greens I would add to their pharmaceutical and surgical treatments, my 5-year mortality would still remain at 30% only.
I informed myself from other quarters, didn't let them do their invasive and risky intervention, and moreover didn't expect to 'feel' better, but
not to die early. In the first year just eliminated sugar and reduced prepackaged stuff (like cookies). Over years increasingly reduced grains, milk; as a life-long vegan added in eggs and fish very gradually again. While monitoring metabolism by doing all the regular lab-works to see how changes are affecting it (again, not by how I felt). Thereby found for example, had to increase salt intake even substantially.
Long story short, it took 6 years till the 60% walking disability of my 'irreversible' diagnosis got revoked by a government agency again. However, I'm not only still alive, but even reverted the diagnosis my internist thought impossible to. And though I don't feel much better (except the euphoria in my taste-buds I do get from immaculate meals, very short lived though...), I do feel still alive.
So maybe better cut down on unreasonable expectations - quiting livelong addictive eating behavior is bound to cause some turmoil, and 1 month can't change a metabolism deranged by years of the opposite. Moreover go slowly, do only changes with which you're comfortable with. Don't monitor your withdrawal-feelings, but lab-markers of health instead.