I haven't had such symptoms and I have tons of parasites.
You are sure it isn't gas? (laughing)
My aunt has diverticulitis and diverticulosis (don't ask me the difference) and she gets a lot of pain in her intestines when she has an infection (which can be caused by something as small as eating a peanut). She also gets high fever and the pain stays.
Probably not what you have, but beware - if you do get those symptoms you need to see a doctor immediately as the infection can eat thru the colon wall and be life threatening. I don't like antibiotics, but that's one time when they really are needed.