Please help me identify cause of pain and these thread like things in stool!

Hi I had started getting swollen lymph nodes in my upper thigh crease where my inguinal nodes would be and bad abdominal pain. I thought it was diverticulitis but after a round of Antibiotics the pain persisted. I started seeing large amounts of mucus and peices of feces with these sesame seed like things in there, eggs maybe? I was eating bread with seeds on it so that is entirely possible, but then a few times I saw small thread like things, never more then one at a time and far apart from each other as far as time is concerned. Then I saw a long one like this. Also, durring the whole time iv had lower abdominal pain and groin pain that would radiate around my testicles. As well as some very slight burning when urinating. I been to the hospital and Dr. My CT scan was normal my CBC +diff was normal and my ultrasound was normal. I don't know what these are and I am seeing them so rarely I don't know if they are a parasite or something else. Anyone with any information please post, I am out of options or ideas and need some advice. Tweet