Are these parasites in my son's stool?

Hello everyone,

My 7-year-old son has had some trouble with his stomach (gut) for about a year. For the last few months he's needed to use the toilet several times a day (often nothing coming out), and often his stool has consisted of quite little "balls".

Lately it's been worse and he's even had some watery stool leaking into his pants a few times. Today his stool consisted of tiny pieces as shown in this photo:



I can't imagine what kind of a normal problem could cause this. Does this look like parasites or eggs? I've had some parasite cleanses myself and after what I've read I wouldn't be surprised if that's to blame here.

We are seeing a doctor tomorrow, but I'd be very happy to hear some ideas before (and also after) that. Thank you so much!