How is your diet over-all? Eating every 3 hours even through the night if you wake can even out the anxiety surges. Slow release foods, i.e. fruits and nuts, bananas, porridge ......... I eat B4 my body is hungry which helps stop the surges. Gentle exercise. Keep hydrated. Did you have PMS previously?
Do ring your Surgery to ask if you need a hike in the AD or maybe an 'as necessary' anti-anxiety tablet as well as the AD.