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Agnus castus contains the hormone progesterone and will affect the normal hormonal balance in your body. It can also affect and stop ovulation.
In your case, Agnus Castus had probably causes irregular ovulation but stopping it caused ovulation to stop completely.
In most cases, the hormonal balance becomes normal within 3 months of stopping Agnus castus . Since it has not, you may need medicines like Clomiphene citrate (clomid) to stimulate the ovaries to ovulate again.
Please consult a gynecologist - you may need blood tests for estrogen and FSH levels as well as an ultrasound to check out your ovaries.
I hope this helps.
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