Constant pain - help!

I've been having serious abdominal pain on my left side. I hurts to stand up, sit, lay down, and pretty much do anything. I hurts even worse right after I empty my bladder and I usually have to sit on the toilet for a minute or two until I can stand. I also think I have pulled a muscle in my lower back, left side that could be contributing to the pain (I've never pulled a muscle so I'm not 100% certain). Then there's the usual hip pain but this is all on my left side. It's constant throughout day and night. Does anyone know what could be causing it?? I talked with my doctor 3 weeks ago but the pain wasn't as bad as it is now and he shrugged it off as round ligament pain.