Dull Ache, lower right back/abdomen

I am a 29 Year old Male. 6' and 240lbs. I have recently developed internal pain in my right side. I've had a back ache for a couple days now so I thought at first that it was just a part of it. But now i can feel a regular strain back ache on my left side but a deeper and more intense ache slightly lower on my right side.  I'm scared it might be something more serious. There are no other symptoms. I was regular this morning, but I've had back pain for a couple days now and i don't know when this other pain started. Should I be worried?

[MarkTPease]

This could be a kidney stone (trust me I am an expert on these).  Drink nothing but water 6-8 glasses per day for a 3 days and see what happens.  If it doesn't go away go see your doctor. You probably pulled a muscle.  Don't worry!