There's no miracle here
No particular diet “fixes” a cycle. But there are a few simple points, each tied to particular days of the month and each with a source behind it.
The things that do make a difference
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1
Iron, on the bleeding days. Especially if you bleed heavily. The article “Tiredness and iron” has the details.
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2
Small, frequent meals, in the last week. That's the NHS's own advice for this week's symptoms: every 2 to 3 hours.
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3
Water. The simplest thing, and the one you're most likely to be short of.
Sources
Health information, not medical advice, diagnosis or treatment. For your own symptoms, talk to a doctor.
Your cycle, honestly.
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