I tripped and fell down the stairs (the last couple of steps). Landed on my hands and pretty badly on my knee and hit my nose off of the front door. My nose is fine, my arm and shoulder are a little achey but what I m worried about is my lower abdomen. I ve been experiencing some sharp pains when I bend down, breathe in too deeply, laugh or raise my voice. I didn t land on my abdomen or tummy in anyway, what do you think could be wrong?