Burst of energy, can't sleep!

I haven't been able to sleep in weeks. My body gets very anxious and it feels like a lot of energy running through my body that I can't get out. I get up and down from my bed all night long pacing back-and-forth in my room. I'm tired but I can't get my body to relax. Last night I tried a warm bath, candles, relaxing music and chamomile tea which didn't really work. I'm 27 weeks. Do you know what this means and how I can get some sleep???