What wrong? Lower right side of my abdomen hurts

I am feeling a pain in a location i am not used to.  my lower abdomen on the right side has been killing me for the past three days.  I have had daily BM's but not as comfortable or as frequent as usual.  So I assumed I was a bit dehydrated or maybe constipated.  But I'm not sure anymore.  I usually drink quite a bit amount of water and juices, but for the past few days it feels like I have had to force drink and food down my throat, my apetite has decreased, though I've still been making myself eat/drink.  I don't smoke, don't drink alcohol or carbonated beverages.  What is wrong with me?

Oh yeh the pain sometimes is just a sharp shooting pain.  it's not ongoing.  I feel it more when I'm gettingup from sitting down or when I'm trying to sit.  Today I laid on myback and relaxed my abdomenal (abdominal) area and pressed the area that hurt and a pain shot towards my right side of my chest and down towards my rectum.