Horrible pain lower right side...

Everytime I stand up, or walk, or move certain ways I have this AWFUL pain on my lower right side. When I spoke to a nurse at my drs office they said it's probably round ligament pain and there's nothing I can do about it. But from what I understand round ligament is more prevalent in your second trimester, I'm already in my third. And how long is it supposed to last?! I get up and down all day long at work and it's just becoming unbearable! Do you think it is round ligament, or are they over looking other possible problems?!