Eryngium foetidum is commonly referred to "culantro" or "chinese/mexican cilantro". Its similar in taste/smell to conventional cilantro, but completely unrelated, with stronger taste. The leaves are broad rather than the parsely type leaves. Its used extensively in thai cooking. I dont know about other places, but they sell it in grocery stores in in south florida.
Question about the floaters etc... I myself have experienced them. First of all, I never had them until AFTER taking mebendazole. Also, I was tested for s.stercolis serology and was negative. I have read of multiple other causes of infections that effect the eyes, including hookworm (ocular larva migrans) and tapeworm. In fact one of the criteria for determining eligibility of albendazole treatment of neurocystercosis is ruling out of ocular cysticercosis.