Yes, let me know, when you find out send me a PM since I will likely forget this thread. My guess is that they checked for common protozoa such as giardia, cryptosporidium, e histolytica... Much of the testing is a shot in the dark.
The magnesium is crashing your system (according to another post) - this would indicate sodium or sodium and potassium levels that are low. This is indicative of strong adrenal stress. This stress is due to strong immune reactions. You need to support the adrenals with nutritionals.
One thing you could try is fresh garlic that is minced or smashed to release the alicin. Garlic is one of the stronger natural Antibiotics . Black seed (black cumin) is another strong natural antibiotic.