This is another anecdote, but this story leads me to advise others to look into Homeopathy once contemporary options have run out.
A young woman I worked with in her early 20s started getting this crazy itching in her scalp. It felt like it was coming from inside her skull, and scratching would not alleviate the itch. It was driving her crazy, and she quit her job and just stayed home. It got so bad that she could no longer sleep.
She went through several specialists and 10's of thousands of dollars in tests. Nothing they gave her helped, and they deemed the problem inoperable. After months of no REM sleep her body started to shut down, her organs failing, and the doctors gave her only two weeks to live.
As a last ditch effort she went to a Homeopathic doctor. After a 30 minute consult he diagnosed her with a brain parasite, and gave her something to take (liquid copper if I recall correctly) for $50 and told her within two days she would feel better. He was spot on, the itching went away the very next day.
I talked to her mother a year later and she was still perfectly healthy.