I can't sleep

Currently 13wks 2 days and I can't sleep I have tossed and turned for hours. I get too hot, too cold, and just can't get comfortable. I try to use my pregnancy pillow but it isn't helping me either my back hurts and I am so sleep deprived. I called in sick to work to get some sleep yesterday, because I can't get comfortable or even sleep for more than a couple hours. I lay in bed all night sometimes get up and sit in the shower. I am hoping this gets easier. I'm exhausted.