You could be experiencing perimenopause at your age. I was early (first in my whole family) BUT it turned out it was mainly due to hashimotos (autoimmune hypothyroidism). Easily remedied with some synthroid.
Perimeno started for me at 32 - I had completely stopped ovulating then and was experiencing night sweats, but I am 44 and still working it, cycle-wise since I started on synthroid. It's just pretty unpleasant, the cycles (now I get migraines from the estrogen crash) and my fsh was in the 40s or 60s the last time they checked at age 43. I still get periods, they are just usually anovulatory. But I made decent eggs until 40.
Anyway, sometimes our bodies go wacky with the hormones. It would be good for you to find someone who has some experience with this stuff.
And yes, I have learned more from these boards than anywhere else.
You will be OK.