I am 29 years old and the gynecologist did all kind of hormone level tests. They came back clear.If you are around that stage of your life where you start having hormonal imbalance, than this explains a lot.
You said 3-4 days a month for a year or so. Which days of your cycle? If the night sweat days are before and very close to your period, then yes, the reason is hormonal changes.
My aunt had horrible night sweats for a couple of days every month when she was in her perimenopausal stage, and some women may go in to that stage earlier than others in life.
I also made a calendar about the night sweats and we didn't find any correlation with my cycle
But I have some good news too! Altough I still don't know anything about the X-Ray, my blood work is perfect!
Now I am more optimistic! I cant imagine that I have a tumor with these very good blood results!