J.,
Congrats! You're in the home stretch for sure, but sadly there's no way to know if you'll have your baby tomorrow or in a couple more weeks. Women can be 2 centimeters dilated for weeks before going into labor. Same with the mucus plug. They are both signs that your body is getting ready for labor, but they don't have a definitive time limit attached. On another note, sharp shooting pain is not normal. Without more of a description from you, it would be hard to know what is going on with that, but you should call your doctor or midwife because sharp abdominal pains can be a warning sign of placental problems.
If you want to ease your contractions while you wait for real labor to begin, drink lots of water (there's a formula for how much water to drink, you take half of your weight and drink that much in ounces every day). Your uterus will contract more if you are dehydrated, so if you drink plenty of water your contractions will ease or go away completely (unless you really are in labor, in which case they will get longer, stronger and closer together until you have your baby!)