It is obvious from your stool that there is certainly a problem.
The best approach would be to first of all use an anti- parasite treatment and that will quickly rule out whether you have a parasite infestation or not.
We would recommend that you take Pepto Bismol orally at the higher range of the stated dose. Do not exceed the safe daily dose !
Pepto Bismol contains bismuth subsalicylate which is effectively antiparasitic.
Note that Pepto Bismol is NOT a suitable long term treatment as it could irritate the digestive tract if taken for longer than a week or so.
Note also that Pepto Bismol will darken your stool. This is normal.
As with all medicines check with your pharmacist that is does not interact with any medications.