Hi Sparkles1973, menopausal symptoms aside, this sounds to me like a side effect of the Sertraline - which is an SSRI and these are known for causing symptoms like anxiety, agitation, nervousness, tremor and movement disorders. I know this right now because I've just returned to using one of them, Paroxetine, after flirting with Escatilopram, both of which gave (and are still giving) me bad shakes, jitteriness, constriction of throat and jaw and chest, difficulty taking deep breaths, and generally feeling very very scared (way more than anxious).
I get what you mean about not being anxious but having physical symptoms of anxiety which then make you anxious and so on and round the circle we go.
I'll post a link to quite a good website which lists lots of useful info about various medications. The one I've posted is for one brand of Sertraline, but you can search for all sorts on there.
https://www.medicines.org.uk/emc/product/12370/smpcYou said you've been on 50mg of the AD and I assume long enough to know whether you were getting any of these symptoms, but it is possible that doubling the dose is bringing on the side effects. If you stick it out they may well subside (one would hope so anyway) but it might take a couple of weeks.
Of course I could be completely wrong, you can never tell with menopause and the hormone imbalances that go on.
I hope you can get yourself onto an even keel soon xx
LL