Castor Oil?

If your already in the early stages of labor will castor oil work? Im not progressing but im in so much pain.. didnt work, walked around for hours last night (which is amazing for me since i do have a bad back and hips ) ive gone swimming, ive done everything (even nipple stimulation, OUCH) nothing works.. but i am contracting and it is painful just not enough to send me to the hospital.. should i try a little castor oil to speed things up.. this is miserable and im sure a few more BMs wouldnt be this bad