endometriosis
"Obviously, everyone's body has different chemistry and because of our genetic predispositions, diet, and environment, study samples of women may all react differently to a certain oral contraceptive. Personally, I found Ortho Tri Cylen Lo to be effective for the first two months, and then I experienced a horrid yeast infection, breakthrough bleeding, and abdominal pains. I took my pills at the same exact time every night with the same amount of water. My sex drive disappeared, and I felt terribly bloated. The absolute worst was my unstable mood. I was making snappy comments and feeling suicidal."