Hi,
Thanks for joining me on ehealthforum.
High progesterone containing pills are known to cause depression, and in your case it is evidenced by your history of feeling better while on the placebo pills.
Consult your gynecology doctor about it. She will prescribe you low progestin activity pills or a combined pill that has low progesterone.
If due to your medical condition the dose of progestin cannot be reduced, then alternative drug treatment to combat depression might be needed.
Discuss these points with your healthcare provider or with or gynecology doctor and proceed with what they suggest.
Take care. Bye for now.