Birth control making me emotional

I’ve been taking birth control since May. It started giving me really bad headaches so my doctor lowered my dose at the end of December. Ever since then, I feel like I have been extremely emotional! I have had some stressful events happening in my life, but I cry over nothing. Could this be from a lower dose of birth control?

I need the hormonal birth control route because I have PCOS. What can I do to help with this burst of being super emotional all of a sudden?