Aw, poor you. I know just how you feel.
Rewind 18 months and wow, for me the insomnia was awful, fitful dosing, mixed up with racing anxious thoughts with a good drenching of night sweats. Low mood was appaling. I have been on SSRI's on and off for the last 30 yrs, but they just weren't cutting it. I wouldn;t worry about swigging antihistamines like night nurse, they do no harm- i've been at them on and off for 20 odd years!, but getting to the root of the problem is better long term.
But this sounds like it is all down to meno.
No brainer for me - HRT straight away.
Didn;t bother with the coil as me and progesterone have never been the best of friends.
Now settled on my own invented regime of 100mcgs of Estraidol patches and femeston sequi 2mgs orally ( it is the only progesterone where i won't get sectioned LOL).
HRT changed my life in a matter of weeks. DOn't get me wrong i still have sleepless night, but they are occasional, not always and the anxiety is better than it has been for many years.
Don't think you are going bonkers or physically melting- It is meno all the way,
I don't bother with any suppliment, never found them useful- it is the hardcore nuclear stuff for me.......LOL