Omnicef and ovaries

I am an adult woman who took Omnicef for what was thought to be a bacterial infection in my throat. Turned out to just be a cold so I quit taking the Omnicef. A couple weeks later I started getting cramps and side aches. Which is strange because I had a hysterctomy (leaving my ovaries) about four years ago. Turns out I have a vaginal infection which is one of the more common side effects of Omnicef. I don't think that a drug intended to cure one problem should create a totally new problem. What good is this antibiotic? I will never use this drug again.