Kathleen, I get that blessed quivering too! It is so, so unnerving! You raise some good questions and points here - I will try my hardest to fish out any research I can on the receptor/cell question!
![Wink ;)](https://www.menopausematters.co.uk/forum/Smileys/extended/wink.gif)
It most certainly is withdrawal - and although I probably didn't frame it well in my previous thread, I was trying to illustrate the point that estrogen withdrawal shares so many characteristics of withdrawal from any substance on which the human body becomes chronically dependant.
I'm going to use - just for example - opiate dependency. Withdrawal includes sweating, nausea, shakes, restless legs, disturbed sleep, emotional instability, anxiety - these are acute withdrawal symptoms. And then symptoms progress into something called Post Acute Withdrawal Syndrome, which is what I also believe happens when periods stop and women are still symptomatic in post menopause. I also believe the faster and steeper (or more erratic) the withdrawal, the more severe the symptoms - just as in a 'cold turkey' withdrawal (for surgical meno) or in peri, like an 'addict' constantly abstaining and relapsing from any other substance.
The receptors then have to down regulate, and this is not a linear process. The receptors are active but not 'occupied', and this is what causes drug cravings or in our case, the horrible symptoms we still get post menopause.
I'm still not sure I've explained what im getting at too well - but hopefully you get the gist!
I've heard the theory that boys become 'drunk on testosterone' at puberty before - it certainly explains a lot! Puberty for me was pretty horrid as well - so I'm pretty sure that's why I'm hating this whole experience too!
![Shocked :o](https://www.menopausematters.co.uk/forum/Smileys/extended/shocked.gif)
xxxx