my hypothesis is thread worms

If I am right-

You'll have to clean them out of your body much in the same manner that you would go about rinsing out a soapy sponge.

You need to cleanse your kidneys, gall bladder and liver. You will have to take oogles of herbs to combat the infection and periodically take them prophylactically for prevention.

You need to take vitamin B-1 and Iodine, eat to live, don't live to eat, excercise, provide your body with the nutrients it needs.

Getting well and staying well is trial and error process, but you can do it.

Do you have a history of pinworms, hemorrhoids, candida, bladder infections, leaky gut?

Worms are perforating your insides. That's my best guess. Get rid of the worms and your health will improve. As always, if a blonde leads the blind...