I ate a few pieces of shellfish a week ago and diarrhea started that evening. No vomiting. A rash the first night only on my arms and legs lasting and hour then went away. 4 days into it. .first stool in morning mushy but as day progressed watery. Started pepto bismol and had roughly 5 capfulls.. now today my stool is very dark but more normal in consistency but notice also some mucus in stool. Is this normal after diarrhea? I take a multi vitamin. .d3..a probiotic and xanax. Also before the dark stool wad very light in color but also was only drinking liquids and little food.