after childbirth is to be expected whether breastfeeding or not - and three months after seems to be the timescale. Happened to me each time dead on three months, continued for about six months, then stopped almost as suddenly as it started. Just keep yourself well nourished and rested, and as Scarlett suggests get thyroid checked to rule out any problems. I'm sure it will be okay.

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"There's this thing called being so open-minded your brains drop out". - Richard Dawkins