2/ standard testing will not always work. If you want positive confirmation use Metametrix GI Effects test. Use panel #2105.
3/ I would suspect you have either e. histolytica, blastocystis hominis or an unidentified protozoa. I have a forum at pptu.lefora.com that has the most indepth info on the web with the exception of badbugs which is geared towards drug therapies mainly for blasto.
4/ Cipro and other Antibiotics are unlikely to resolve, typically it is necessary to do drug combining such as Secnidazole (Flagyl) with Alinia or Iodoquinol or diloxanide furoate, Septra etc. badbugs.org has a list of drug combination and I have a list at http://pptu.lefora.com/forum/category/pptu-forum-topics-test/
5/ most herbals designed for parasites are worthless when coming to these. We are currently using multiple approaches I am using Thorne labs SF722 (undecylinic acid ) (spelling) with Tanalbit and a few other things. http://pptu.lefora.com/2011/02/24/my-strategy/