Heptacampeâo,
Yes, if you suspect any type of parasite, you should definitely get a stool sample analysis.
But I'm wondering if taking the antibiotics was enough to eradicate any good gut flora you might have had and thereby creating a big problem?
Have you tried adding back, or adding if you weren't before, some good probiotics?
I would recommend VSL#3 because they are especially formulated for UC with the most number of billions of active cultures.
Let us know what happens with your stool cultures.