Can I have gone thru Menopause without any symptoms?

I will be 40 in a few months.  My menses never returned after I gave birth to my son almost 2.5 years ago.  I breastfed him for almost a year.  I have had no spotting or any signs of my period returning,  nor have I had any hot flashes.  My OB/GYN tested my fsh and that came back at 117.2, LH is 50.2, Prolactin is 6.3, and estradiol is 6.  117 sounds like such a high number - is that a post-menopausal number?  I am also on Synthroid after Graves Disease.  I haven't been on a steady dose since before I was pregnant (seems like a normal T4 is a moving target for me!).  But I've only been slightly low or slightly high with my last T4 at 1.68 and TSH at .112.