first hon relax. it sounds like you are getting really nervous about it.

contractions at first feel like your tummy is tightening then relaxing. doesn't hurt at first. as you get closer the pain increases.
they normally won't give the epi til you are at least 4cm dilated. if you have the epi you most likely won't feel burning or the stitches you might have to have.
another thing about the epi it can either hasten delivery or slow it down. I have never seen it go slower though. always have seen it speed up.

about the pooping and peeing. it happens and they are use to it. my cousin's wife actually had pinto beans the day she had her daughter lol she pooted in the drs face lol. then pooped. too funny!