Most docs in this country don't even understand that they have the usual, generic to America, parasites themselves. How can we expect them to know about possibly more exotic kinds as found in other countries?
Though I do feel you no doubt have parasites, ditto your loved ones, and there is info in the links below to help you see that w/o expensive tests or treatment, there of course may be other things going on too, like mercury or other toxins, candida and so on. Some of those issues are addressed in the info give below.
As for hypothyroidism, the blood tests (ditto for adrenal) can be flat wrong. For ex. I was told twice with blood tests that I had no problem, then wound up in the ER where it finally showed up enough to fall into heir inadequate ways of categorizing such problems. There are informal checks for that & adrenals which you can find in the website I give.
Hang in there. This is going to take some tikme. Months at least. Sometimes you will even feel worse. You will have to experiment and learn.
Re the topic of enemas sometimes mentioned in the link above, I am adding a personal feeling of caution about colonics - professionally done high colonic enemas. I have seen them really depleting people's energy, though some really like them. They do flush out a lot of good bacteria & probiotics along with the junk.
There is really no data that I know of to show that good bacteria can be replaced by over the counter supplements, or even things like acidophilus yogurt, kefir etc., after such a highly invasive wash of the intestines. (You can tell if your yogurt or kefir has live probiotics by adding a heaping tbsp. to regular milk, then letting it sit for 8 -16 hours. If it’s the real stuff the milk will thicken and give you more yogurt or kefir.) Maybe so, maybe no, but there is new info coming out that low probiotics in the gut can cause things like depression (see Dr. Mercola & Dr. Marsha Campbell’s Youtube vid for example) and even possibly things like autism if the mother's probiotics are too low and she doesn't pass enough onto her baby in the birth canal or through her milk.
There are other ways to clean out the intestines, for example some like Blessed Herbs, some like Oxypowder . Simply adding more roughage & drinking more water can be effective.
I'm no expert on any of that, just presenting what I worry may be a potential hazard. Mho.