Hello mam, thanks for trusting health care magic.
It can be early menopause
especially looking at your history of egg donation
To confirm the same get your hormone levels tested viz FSH, AMH and TSH
Also include nuts, soy proteins,milk and lots of water in your daily routine.
Avoid hot climatic conditions and also stress
After you get your reports visit a gynecologist for prescription of medicine if required.
In case you have any other question you can consult me on health care magic.
Dr Manisha Jain
take care and wish you all the best.