Mum of schoolboy described as "demonic" is raising money and spreading awareness of the unknown condition that made him "change overnight".

William Hewlett, from Houghton, was just seven when he was diagnosed with Pediatric Autoimmune Neuropsychiatric Disorder Associated with Streptococcus (PANDAS/PANS), a condition which caused him to "turn into something from The Exorcist" .

Now, William, nine, is back to school and his mum, Johanne and sister, Charlotte are spreading awareness in aid of PANS/PANDAS awareness day and fundraising for families affected by the condition.

Johanne Hewlett, 44, said: "We've probably spent over £15,000 on medical fees for William and treatment should be available on the NHS.

"We need the government to acknowledge this unknown condition."

William's sister, Charlotte, 11, wanted to raise money for the charity by taking part in Walk the Test Way, so Jo created a Just Giving page on her behalf which generated £287.

Charlotte was also invited to be the mascot at a Southampton FC Women's game and managed to raise £135.

Their goal is to raise £500 in total.

Georgia Tuckey, Founder of Charity PANS PANDAS UK said: "That money could help develop literature for parents to take to their healthcare professionals and Drs, as currently only 10% of UK GPs are aware of this condition"

PANS is a condition where your immune system creates antibodies to fight a bug or problem but sometimes the antibodies get "confused" and attack the brain by mistake, causing disruption to a child's normal neurological functioning, leading to compulsive or Tourette’s-like behaviour.

William would "lash out" at his parents regularly, and often try to "step out in front of traffic because he wanted to die".

Johanne said thousands of people are misdiagnosed with this condition, with kids being told they have got autism or mental health conditions.

She added: "Seven year olds don't suddenly become autistic, they don't change over night."

She believes her son was diagnosed with the condition after being exposed to mould.

William, who attends Kings Somborne C of E Primary School, was treated by alternative methods which have helped to stimulate a natural healing response, and so far seems to be working for him.

NHS doctors originally said he could have treatment called ‘IVIg’, which is like ‘new blood’ but at the last minute the NHS changed their minds.

The IVIg treatment offered by the NHS falls under a "grey indication", meaning the evidence base for using it is weak and should be considered on a case-by-case basis, despite the fact it was recommended by doctors for William's illness.

Johanne, who used to live in Romsey, said: "This is happening all too often, with children across the UK being denied access to the correct treatment"