Our natural adrenaline kicks in at around 5/6am in the morning, it then falls around 8/9am and starts going up around lunchtime, peaking at 5/6pm and then gradually falls at around 8pm.
High oestrogen (e.g. from oestrogen upsurges in peri) causes adrenal rushes as its over-stimulating. Low oestrogen (down surges or post meno) causes the brain to panic at the lack oestrogen and throw out adrenaline to keep the heart beating. Hence, both situations can cause physical anxiety which is felt more at the peak adrenal times. A graph can be found here
https://goo.gl/images/khEsvtIf you get the anxious feelings out of the blue, say when engrossed in a film, then it's likely to be hormonal. Also, physical anxiety cannot be brought down directly by the mind, in the way that emotional anxiety can (although hypnosis can work by manipulating the central nervous system).
Beta blockers dampen adrenaline and cortisol, so can directly calm things down. I had to resort to them when my hormonal anxiety was making my, already severe, nausea worse and they were a real help to take as and when. Once my surges calmed down I could just ride out the anxious feelings and I found watching creepy films helped, as you're meant to be feeling scared so your hormones and reality are more in sync! The relaxing stuff is great too though for keeping you from worrying at the same time.
For all the belief driven anxiety, habits can make us feel as if it's just part of us and will never change but it's never too late to completely turn things around! Windy Dryden's books may be of help to some of you which are is based on Rational Emotive Behavioural Therapy and he has a workbook where you can be your own therapist. REBT basically changes unrealistic/unhelpful anxiety, depression and anger etc. to realistic/helpful concern, loss and annoyance. It's simply the exaggeration of what is really happening, or what might happen, that creates the exaggerated feelings.