To the OP - A suggestion would be to do a sleep study...to rule out sleep apnea.
While sleep apnea symptoms are not necessarily not being able to fall asleep initially, it can result in falling asleep for a very short period...then not being able to get back to sleep.
And then of course, is the fact that women suffer more from insomnia...than us guys.
I attribute part of that, totally unscientific of course (

), to guys being able to compartmentalize
'our simplistic few thoughts at one time' (

)...and not run a continuous loop movie reel of everything going on in our lives.
Here's a good article...on suggested remedies.
Why Women Are Twice As Likely To Have Insomnia Than Men
Quote:
Women are twice as likely to have insomnia — the inability to fall asleep and stay asleep — as men. Much of this has to do with hormones, but some of it has to do with the ebbs and flows of a woman’s life. Here are three common causes.
On the other hand, if you have experienced insomnia three nights a week for three months or more, you have chronic insomnia and should seek the help of a health care provider, such as your physician or a sleep medicine specialist.
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Good luck in finding help.