Bubby. Here's what I'd do. Change courses. Accept for now that you don't have strongyloides. Elisa tests are very accurate. I don't know where you heard that the test does not work if they are disseminated. This is new to me, and to be honest, seems to be exactly the opposite of what I would expect.
I certainly believe you when you say you have worms. But I think you said the ones you saw were white. I am quite certain that strongyloides larvae would not be visible to you in the stool. They are microscopic and transparent, as I remember. They are extremely difficult for laboratories to see. You didn't say what size the worms you saw were. I don't believe you would have seen a lot of adult strongyloides.
I believe you should begin the intestinal and systemic roundworm protocol which is only albendazole and see how it goes. I, personally, have done more than one of the protocols.
Do you know what Bells Palsy is? One side of the face is paralyzed and droops. I had that many months before I started helminth therapy. One side of my face was totally drooping for a month. I couldn't even close my eye. It was hideous. But it totally went away. parasites caused it, not medicine because I wasn't taking any.