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There are many possible causes of your symptoms. Yes, one of the possible causes of these symptoms would be certain parasitic infections of the gut, but this would not be one of the more likely possibilities. It is more common for there to be a viral
or bacterial infection of the gut. It is also true that some people can have some persistent gastroenteritis symptoms because of an alteration of the normal germs in the gut. There are certain good germs in the gut and the loss of these germs can also be a cause of such symptoms.
There also are certain inflammatory conditions of the gut, although this would also be less likely. Sometimes, there can be functional disorders of the gut, in which there is an increased or decreased muscular activity of the gut (or both) that can cause such symptoms.
Ultimately, it would require a proper evaluation to determine the exact cause of symptoms. The usual first test for a parasitic infection would be stool tests to look for parasites. And these are tests that can be ordered by your primary care physician.
If you have any further questions, please let me know.