Someone once asked...
Someone answered with kindness...
If you ever have the chance to spend some days in an true low-pollution environment, take it. Gotta be low indoors too (the less stuff there is, the better, because "normal" furniture and materials can be highly emissive). There are natural pollutants too! A farm is not necessarily low-pollution. Better if there is no excessive nature around :) If your chronic pain fades away, specially the neurological symptoms, you would get a clue about what is triggering those side-effects. It is much more common than what people think, but we only realize once we experience the relief. And if not your case, you simply got some relaxing vacations :)