Pain!

I was wondering if anyone has ever felt like I have the past couple of days. Since last Wednesday I had mild cramps and very little back pain oh and some gas. Friday I went on a trip for like 8 hrs in total. When I got back the pain was so much worse and the gas more frequently, I went to the bathroom (#2) a lot this weekend. I thought maybe I was starting my period but I haven't. I was fine all day but around 3:30 I had this horrible pain in my back. It felt like my legs and back were going to give out on me. I popped my back and tooted a little and the pressure relieved a little. Has anyone felt this before? If so what did you do?