I'm a 26 yo female. I've been having diarrhea for the past 7-8 days with bad cramping and sometimes bloating (but without passing gas). The symptoms started 8 hours after eating some sushi with salmon, shrimp and other fish (the diarrhea woke me up at 4 am that next morning) but I'm not sure if it's because of the sushi or not. Since then I've had better and worse days (this Sunday I could barely stand up because of the pain and tension in all my abdomen but was ok when lying down). The next day was better.
Today when wiping after a stool, I saw some blood caught in mucus on the toilet paper. The blood was not bright red nor dark, it was just... normal blood I guess, caught up in the mucus and separated from the actual stool which was soft brown diarrhea.
I'm rather worried about this.
I should mention I had a colonoscopy done less than 2 years ago that showed everything ok. I didn't have diarrhea back then but I was diagnosed with Irritable Bowel Syndrome because I had some pain in my left abdomen (which BTW was probably from my ovary but nevermind ).
What could this be? Could this be cancer or rather an infection?