Suggest Treatment For Persistent Pain Under Shoulder And Abdomen

I am a 37 year old woman and for the last two or three days I have been in severe pain. This morning I woke up with a burning/stabbing pain in my back under my shoulder blades and sharp stabbing pain in my abdomen. It has persisted throughout the day, but is not constant. There isn t really anything that makes it worse or better. I have also had a large amount of pain in my joints (especially my knees and shoulders) over the last several days. I do not have insurance at the moment and am trying to decide if this is severe enough that I need to see a doctor anyway or if it will just work itself out.