What is happening!?

Stephanie • Mom of two handsome boys Ryker 3-5-14 and Maddox 9-4-15
Should I be worried? I'm 30 weeks and my stomach has been constantly rock hard and painful for the last 3-4 hours. And it's so tight that I don't even look as pregnant as I did a couple days ago! Nothing has worked to ease it up and I'm so uncomfortable I can't sleep :( 
And this was taken a couple days ago