Welcome to you! I have fsgs, too. I'd love to know what caused it. I was hospitalized with pre-eclampsia during the latter part of my pregnancy in 1991; my blood pressure was high at that time (but not before that), and after delivery by C-Section, it went up really high. But as time went on, it was OK, but I kept losing protein. Six months later, I was biopsied and got the diagnosis. I don't remember having high bp because I was not treated for that. But my doc did keep close tabs, and when my bp started to go up, I went on meds.
I personally believe that in my case, it IS an autoimmune problem that was triggered by my pregnancy. When a woman is pregnant, her immune system has to accomodate a "foreign" mass, and I don't think mine accomodated much of anything. That's my theory, and my neph hasn't come up with anything better and agrees that it's a damn good theory.
I have to often explain stuff to my other docs. My gynecologist refuses to have me do a urinalysis during my annual checkup because my pee is too complicated. And my dentist looks baffled.