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It would be a good idea to speak to a physician.

That's not because your current system has any problems--if it works for you, great! But that discomfort you describe is both abnormal and frequently linked to health issues that could cause serious problems over time.

Source: dietician relative on the couch next to me, FWIW.

You might want to get checked for hypoglycemia. That doesn't sound normal. (Unless you pair too much caffeine with your fasting)

The fact that you can do nighttime "fast" but get anxious after 3 hours while awake indicates it's just a mental issue as well.

Sounds like you have a serious medical problem, you should see a doctor.

You're an outlier.