The pandemic gave me chronic stress, which as a result gave me anxiety, and the main external stressor (financial) hasn't gone anywhere so the anxiety has really been kicking in over the past 6 months or so. I've developed all kinds of odd physical symptoms, that I never would have put down to anxiety except I've been checked out medically and there's 'nothing wrong'. 

I've always been someone who loves learning. Understanding why something is really helps me not stress about it. So I was wondering if anyone could recommend any good sources of information on why anxiety affects the body. All I know is that is affects our body chemistry, but which chemistry, and why does that result in physical symptoms?

I'm particularly interested in understanding why I feel tense when I try to go to sleep, internal tremors, lightheadedness and dizziness, heart palpitations and 'skipped beats' with the hard to describe "wave" feeling that goes with it. And why do I get these sensations when I'm not consciously stressed or anxious about anything.

I don't know how much knowledge there is out there on this (I suspect we might know really know how it all works) but my family doctor just kind of shrugged. When I was diagnosed with hyperthyroidism (Graves) a few years ago I educated myself and ended up knowing more than my doctor and got myself to remission - I laugh when every other medical professional I speak to immediately asks if I had my thyroid removed... no, you don't tend to need that if you follow the current science! Anyway, I'm curious what the current science is. Are there any good books / Youtube videos / Ted talks / research papers out there? Whenever I google I tend to find websites telling me I should just do yoga and try to relax. I'm not looking for how to fix it with this, I'm trying to understand it better so I worry about it less.

Thanks in advance :-)