I am an emotional wreck!!!

I have cried probably 8 times today... My husband working on his truck, my boss trying to make me work over time, sciatic nerve pain, lazy baby, the thought of going to work tomorrow, my husband not being home when I get home (working on said truck), because I was crying, because I want to go to bed but I hate going to bed until my husband is home. I can not get a grip!!! I am 27 weeks pregnant and have NEVER felt like this until today! I just feel so emotional! How can I help my self?!