If you think you have parasites don't waste your money on probiotics yet. Most people on www.badbugs.org who have parasites say the same thing, they can't handle probiotics. Or, you could buy some and try them out and keep them by for later.
Or better still, buy some organic Apple Cider Vinegar. I think it's great stuff. I take a couple of tablespoons full with equal water after each meal. Helps with digestion and Shelley (Ask Shelley.com) says it's a probiotic (when organic). Cheap too!
Good luck. (If you have the money and nerve try colonic hydrotherapy - I would never have done it without Curezone and I think it is a very important therapy for all health issues)