Bad Sciatica Attacks

I'm having bad Sciatica attacks today, almost the whole day. It happens each time I walk or stand. I can feel my baby moving and kicking all the time and when this happens, the Sciatica tends to attack me. It gets so bad that I have to wince and flinch in pain and half squat while walking or sit down immediately if I am standing. If this continues, I think I need to be on partial bed rest for the next 2 weeks till I deliver.