I'm one week into my MonoNessa birth control tablets (second month) that were prescribed to regulate my menstrual cycle. I'm 48 years old, and I went to my doctor because my periods were irregular, sex drive down, getting night sweats...perimenopause symptoms. Since taking the pills, I'm extremely fatigued, and I have an upset stomach most of the day. I've been taking the pills at night, usually on a full stomach. And to top it off, my sex drive is worse than ever! Help!