I know hormonal changes and stress can be a factor...
there are a lot of studies that have been done on Progesterone..
it can sometimes help and sometimes make it worse..
My acne went away as I got older, yet I had a big burst of it
right before menopause hit...
have you seen a doctor about hormone levels? I wish you well
in this struggle, it aint no fun is it.
this site has some info that might be of help..there are others as well
http://www.acneteam.com/acne-&-progesterone.html