Birth control causing terrible mood swings?

My girlfriend never used to be the crying type, I cried more than her, but lately she has been getting so sad at times that it's just uncontrollable tears that I don't know how to help. She has been through a lot in the past year, including the introduction of birth control 5 months ago which is about when the mood swings started. I'm just wondering if anyone can help explain this because it's really straining our relationship.

From smiles to tears in a matter of seconds, and from holding hands to hitting me in just a minute. And yes, I do deserve some of it, but not like this. Please a help a couple out.
 
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