Does physical stress effect your period?

I've always been regular, but since I hit pre-menopause and started on hormones, I feel so delicate. These last 4 months I've had 1 physical issue after another (horrible insomnia, bad reaction to a drug, tooth infection/extraction) that seem to have taken a toll on my body. I keep getting my period after each upsetting event, whether it's due or not.
Ladies, have you ever hit a rough patch where you had similar troubles? I keep thinking I'll re-balance, but then something else hits and oopps- another period.
Opinions?Does physical stress effect your period?
What kind of hormones are you using? Did you ever try Remifemin? I hear you. Insomnia is bad.
http://www.remifemin.com/go/remifemin/ho...
eh try multivitamins, and i think stress affects anything.