Hey Sunny,
I had similar experiences with birth control pills when I was a young adult. I became very depressed, coming home from work crying every night and finally gave up on them. I also suffered from post partum depression that went undiagnosed. Like you, my gyn recommended bc pills much later on but I decided not to take her up on it even though I got the same explanation about lower doses. I toughed it out a few years.
As far as current behaviors influenced by the past, yeah, I think you described it well. I am humbled by the knowledge but sometimes feel on overload with the information. It takes me a while to work these things through. In the meantime, I talk to you guys--it helps!
Good luck with your new meds.