Morning. I was advised by the Association for Pre-menstrual Syndrome [NAPS] to eat every 3 hours to ease symptoms: intense, sudden nausea, crashing fatigue. That's every 3 hours 24/7. I've cut processed foods from my diet to which has improved my over all health.
U could try a non-drowsy anti-histamine for 3 nights to get into a pattern of sleep.