Birth control in and of itself can change the body chemistry enough to create emotional and psychological issues. Changing the body's normal way of having a balance of estrogen can create issues.

I struggled with endometriosis, it got so bad I had to have lazer surgery. I was given an "implant" in my arm of Lupron that stopped me from having my mentral cycle so I would heal. That resulted in depleting my body completely of estrogen to which I endured such a disabling depression that I could not even get out of bed. I was NOT told this was due to the Lupron, but, that from testing my blood it was recognized that my estrogen levels were completely depleted and that I had to take estrogen pills and was also given Zoloft.
It took a while, but gradually I began to get out of bed, spent many days just sitting on the sofa, gradually the cloud was lifting to where I eventually gained myself slowly back again.

It would be several years before I would finally get to know it was the Lupron that caused this to take place, unfortunately, because I was not told that I lived in fear of how I may lapse into a major depressive state. Unfortunately, even though my gynocologist knew, he did not tell me because even though this effect was understood about the Lupron, it doesn't come out right away.

It is very, very important to make sure your estrogen levels are "healthy". It is also important to understand how birth control can change the levels of estrogen to where it is VERY unhealthy.