What Does Severe Pain While Putting Pressure Indicate After A Fall?

Hi.. I had a pair of high heel boots on last Sunday. I walked on a slippery floor and fell flat on my butt very hard! The way I fell was simular to a James Brown spit with one leg foward and the other bent. I was able to get up on my with very little pain at the time. I figured the pain would present the next day in my leg or tail bone but to my surprise the pain was very mild in my leg and there was no pain in bottom at all. I noticed two days later my side was hurting with a mild to moderate pain. The pain is located exactly in a certain spot up under my rib cage on my right side. If I put any kind of pressure or even slightly push it the pain goes from a 3 to a 10! It hurts so bad that even scream out loud after I push it. It does not hurt when I breathe nor when I walk. I can feel it but not to the point where I can t do anything. I cant sleep on my right side without feeling the pain because of the pressure to my side. I can t even lean up against my counter top while in the kitchen. I m 5 1 tall,145lbs and a healthy 35 yr old woman otherwise and I can not understand how can a slip and fall to my bum can cause this nagging pain in my side for a whole week. I was thing that maybe it was a sore musle at first but now I m not sure. I think I may have really damaged something!!!