Tmi! No pics, potty trouble.

So for the past few days I've felt really sick, really crampy and a few braxton hicks now and then, well today i got diarrhea really bad, now i feel like i really need to go but nothing is happening, and i just started cramping again, i have a dr appointment tomorrow so im trying to hold off on calling. Baby is moving fine, and im not having any contractions, i did however get 3 really sharp pains in my lower abdomen on the left side about 30 minutes ago. Im dilated to 3 cm but this feels nothing like labor to me, 3rd child. Should i be concerned? Am i just sick and something didn't agree with my tummy, I've already taken two extra strength tylenol due to a headache i was having.