I need your guys help with carb intolerance?

Could switching back and forth from Keto to higher carb diet cause fatigue? I know it can make you tired initially, reintroducing higher carb, but this is going on 2 weeks of extreme exhaustion for me. I've had blood work - thyroid is fine, not diabetic, etc. Now, I have other suspicions. I did take prozac 10mg for 2 weeks, went off cold turkey because it was making me feel weird. Woozy in the head so to speak while I was on it. Now, I know this drug stays in the system more than ssri's, so it could be the cause. Even though doctors say that it doesn't have any side effects coming off. I call bs. I'm desperate for an answer guys, please. Even an inclination.

Thank you.