Aching in my ribs can anyone help?!?

I've had this aching in my ribs for the last 4 months. It used to be only when I got out of bed in the morning. But for the last couple of days the ache is there all the time. It's on both sides and it is right at the bottom not far from where both sides connect. I have no other symptoms with this and it's driving me crazy!! When I press down on my ribs they are a little painful but nothing too bad. The way I describe the ache is: when you have been slouching for a while then sit up and you get that ache in your ribs. Any help appreciated thanks :)