scanty but regular periods and thinning hair

I am 3 years olk, doing my ph.d at the university of minnesota. here's my menstrual history.

1984 - menarche, normal 28 day cycles

1996
started to have scanty periods, weight gain, was diagnosed with hypothyroidism, took medicines for a while, then quit. Blood workup thereafter has always shown normal thyroid function (done in summer 2004 and Dec 2004)

1999
In October I spotted for about a month and then for two months afterwards, my periods were missing. In December, I went to an Ob-Gyn., got an ultrasound of the ovaries and was told I had multiple small cysts on my ovaries and the hormonal workup showed PCOS. I was put on the pill (Triquilar) to regularize periods. I put on 12 pounds on the pill, felt very unhealthy, and finally quit it in Nov 2002.

Nov 2002 – April 2003
For 6 months thereafter I got regular periods, got pregnant and had a baby in Feb 2004

Mar 2004
periods returned as I wasn’t breastfeeding, and remained normal for about 8 months and then some irregularity started to show up.

Feb 2005
Met another ob/gyn who did a lab workup and said nothing was wrong and the lab results looked good.

Mar 2005 – May 2006
my periods have progressively become scantier. I only bleed on the first day, thereafter I spot for the next 4-6 days. Have tried homeopathy treatment Sepia nd phosphorous when i was in india but have now run out of medicine. I think it did definitely help, not with the scanty periods but with the hair loss.

I get cold hands and feet. I suffer from moodiness, often feel depressed and obsess a great deal about my hair loss/ hair thinning and scanty periods. I eat very healthy, low carb, lots of vegetables and fruits, drink plenty of water and stay away from anything artificial and synthetic including cola drinks.

Is there any constituional treatment for scanty periods and hair loss for me?