I have had intense RLS for 30 years.
I recently discovered a major cause.
Fruit or vegetables contaminated with agricultural chemicals.
It is probably a pesticide, herbicide or fungicide. Or all of them.
I changed my diet to include only organic food.
Not good enough. It turns out that many organic foods are contaminated with one or more of the agricultural chemicals to which I am sensitive.
And also many common medications.
But if I eat a restricted diet, more often than not, my RLS is diminished by 90%.
The connection:
Studies (Google Scholar) show that agricultural workers exposed to pesticides, fungicides and herbicides get Parkinson's more often than the general population.
There is speculation in the medical literature that Parkinson's and RLS have a common cause.
People with RLS have a 2 to 3 times greater likelihood of developing Parkinson's than the general population.
The best way to check is to stop all medications and fast for 3+ days.
If your RLS disappears, you are closer to knowing the cause. And you can have hope again. I would love to hear from you if something similar has helped you.