Also, I agree with RainyCloud's suggestion about
trying to get any free or low-cost parasite testing through insurance first, if that's an option.
Otherwise, I'm aware of labs like Diagnostic Solutions Laboratory that offer the GI-MAP (GI Microbial Assay Plus) and the Pathogens Panel (stool):
https://www.diagnosticsolutionslab.com/testsThere's also ParaWellness Research:
https://parawellnessresearch.comA couple of members have tested through them, though I'm not sure how helpful it was. My impression is parasite testing in general is tricky, given how many possible invaders there are, the limited number of tests available to find them, and either not capturing or spotting them in the stool collected.
Still, something may be better than nothing. Or, I guess one could always try a few different parasite protocols and hope that casting a wide net of overlapping supplements or medication protocols might find and eliminate unwelcome guests. But, that might also be hard on sensitive guts.
The following lady has some interesting ideas:
http://debugyourhealth.com/parasites-in-humansI'm skeptical of some of the modalities employed, but she reported success and that's all that ultimately matters. Things like homeopathy and energy testing, thus far, haven't worked for me. But, others have had success.