Please help Tommi to see again

Hi my name is josie, I am currently trying to raise funds to fund a trip to Germany for my son Tommi to receive medical treatment to help him to regain some of his vision. In 2018 Tommi was a healthy happy boy Tommi is autistic, he started high school in August 2018 with 20/20 vision by October 2018 Tommi was completely blind with light perception only. After numerous tests and procedures there was no diagnosis as to why this had happened, February 2019 we discovered there was an issue at Tommis school where the water was contaminated and had turned blue we told his consultant about this and he had him tested for heavy metal poisoning to which the tests came back positive for arsenic and nickel poisoning. The local council and government refuse to accept that this was the reason that Tommi lost his vision and insist it's a coincidence. We researched and found out that there is a clinic in Germany who perform Electronic Stimulation Therapy which can help Tommi regain some vision, we have asked the NHS to pay for this but were refused Tommi is now almost 4 years without vision he is only 16 and we really would be more than grateful if anyone could donate to help us reach our goal for Tommi xx