help please!!

Okay so I am 18 weeks and for the past week I've been having back pain. It's just on my lower right hand side too. Over the past week it gradually got worse. Now it just feels really severe. I can barely fall asleep but when I do I always wake back up because I'm in so much pain. I try everything! It just doesn't get better. I know back pain isn't a cause for concern but it's just so bad that I can't sleep and I just want to cry all the time. Should I go to the doctors or is there things I can do to ease the pain?