HELP !!

I took plan b 2 weeks ago. My body is very sensitive to changes and I also take birth control pills. I feel so awful. I have been nauseous, hungry 24/7, had headaches, my body feels off. It totally screwed my hormones up. I'm supposed to start my period in a few days but I know plan b effects your cycle. When will I feel back to normal?? I have heard of plan b messing up with a lot of people like this