Why am I having mood swings suddenly at 8 months postop??

I started taking Ortho Tri-Cyclen with my first postop period in the hopes to prevent the mood swings that I've heard about (and prevent pregnancy until my body is ready!). Now, eight months postop (and down 110 lbs), the last couple of weeks I've been psycho! One minute I'm extremely happy and satisfied with my life, the next minute I'm depressed, crying or being nasty to my husband. I thought the birth control pills would help even out my hormones and they seemed to have worked up until lately. My period was almost nothing this week so I did a pregnancy test just in case and it was negative. Anybody have any suggestions? Anybody suddenly have severe mood swings after this long? Thanks!

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