Hi I am sorry you're dealing with this.
It must be really upsetting to find that out about your husband, but please don't let it make you feel even more insecure about your appearance.
Whilst I have no experience or advice regarding your husband, I do want to say that you are not alone as a female facing hair loss.
Having had my hairline, which was too high to begin with, recede since my teens, I lived in hats and hairbands for years before starting to wear first toppers, then full wigs about 5 years ago.
I am glad now because my "hair" now looks better than most women's my age, and especially now my bio hair which I keep buzzed is starting to grey - I don't have to dump a bunch of toxic chemicals on my head every 4 weeks or spend money on hairdressers!
I know that those new to hair loss can feel uncomfortable about alternative hair, but I can highly recommend watching some of the videos on YouTube by other women - Denise Sheets is really good, and two brands of topper that I love are John Renau and Rene of Paris.
No matter what anyone may try to tell you, or rather sell you, there's no good treatment for hair loss. No shampoo, no lotions, no lasers, pills or microneedling etc.
Save your money and avoid further heartache.
There's no evidence it is caused by any type of hormone therapy either so don't blame yourself for anything you have taken or done etc. It is common in women who do and don't take hormones, but because there's so much shame and stigma around hair loss especially as a woman people just hide it and don't talk about it so you think it's rare when it really, really isn't.
Also I would keep it off your medical records as it could potentially be used to deny you testosterone either now or in the future, even though in most cases female hair loss is not androgen driven.