Prescribed Bactrim 800 mg for 10 days due to an abcess on Jan 6, 14. Now 4 days late. And Im feeling fatigued, sleepy, and a little foggy. I just took a Prego test as im very regular...came back negative. Im sooo glad I found this site. Seems like im not the only one suffering from a missed period. Does anyone know of a way to detox the body to vet it back up to normal?