Was this treatment done by a doctor? Not to jump to conclusions but it just sounds a bit....quackish.
I admit, a lot of the holistic stuff can sound quackish (especially when poorly described by someone without a full understanding, like me)
But I think that's just because such methods are not common. I mean really, the idea of bombarding you with radiation in the hopes that it will kill the cancer cells before it kills you sounds far more quackish to me. I'm fairly convinced that future generations will look back on that practice in the same way that we look back on the medical practices of medieval europe.
But back to the topic at hand.
J Miller, my Dad had chronic exhaustion due to high levels of mercury and nickel, it's not a stretch to assume similar effects could occur due to another heavy metal, like lead. However, lots of things have been known to cause chronic exhaustion... some people develop sensitivity to certain chemicals, others get lyme disease or Epstein-Barr and don't know it. From what I've heard, chronic exhaustion one of the hardest things to treat (by any branch of medicine) because there is no single cause.
Although I wouldn't worry too much about the lead paint unless you are eating it.