My advice is keep going tested. If you can afford pay for the test. Same thing happened with so so many people here on CZ.I am Est Europe based and we have the same problem here with testing. is very hard to find a good lab which can really do the tests. it took 2 years for me to find out parasites - I knew it all the time. and 5 endoscopies to find Hpilory which by the way was not find by endoscopy :) :(.
Which country are you living in? Maybe people here can advice regarding good labs.
- you can continue testing to know exactly what you have
besides parasites you may have bacteria or ...
- you can put a picture of the "bugs" and ask people here
- you can start "blind" parasite cleanse no matter what. sometimes is not the best approach.