Like Carmen, did you also have swollen breasts all the time with the combined pill? Breast tenderness, along with headache, nausea or vomiting are side-effects that are often linked to estrogen. Almost 90% of women who change from one combination pill to a progestin-only pill are satisfied with the change, as is reflected in the comments collected in the doctor’s office: “It helped me get rid of headache attacks….”, “Nausea? I don’t know what that is anymore! ” ” The sensation of vomiting tormented me, I finally brought it to an end!” “I am satisfied with my choice, it makes me feel better, and my boyfriend is…..happier 😉 if you get what I mean! “