The earth was hit by an intense geomagnetic storm on Oct. 24th and 25th and that had an negative impact on HF radio and other communications systems. Here's a link to an interesting article about the storm:
10 meters should be one of the easiest bands to work DX, requiring a relatively small antenna and low power. Watch the DX clusters or listen for beacons to indicate when the band opens up. Still, stateside radio contacts should be very doable on 10. Keep trying. Is your antenna your mobile?