I also forgot to mention that these symptoms started occuring the day after my period ended. I don't know if this is of any revelance though...
I'd go to your doctor and ask. It could be from something in your diet.
I just have been having this problem for 2 weeks. I have had vertigo nausea and throwing up. Now orange-red stools that were so dark they looked like blood. I have not ate anything of darker nature like beets etc that can cause change. I read something about bowel salts at one point out of curiosity maybe if there isn't enough it causes change in bowel color. I went to the lab today to do cbc,. stool and c-diff testing hopefully we can help one another by finding out the reason. I have been feeling bad and don't really feel that great. Cramping stomach wise and bathroom from diarrhea to watery stool....