Help a 15 y boy get urgent emotional help

We are trying to help a single mother of three from Forest Row that  has a 15-year-old boy who is in urgent need of psychological, emotional and psychiatric help. He can’t sleep, has depression, has just been kicked out of school and has suicidal thoughts.  His situation  and as a result the stress on all the family is getting worse by the day. 

The boy is on a two year waiting list for the official youth mental health services because he isn’t sleeping and on the other hand the NHS isn't dealing with the sleep problem because he is mentally unbalanced. They are just falling between the cracks of bureaucracy.

He needs to see a private psychiatric clinic and get help ASAP. There are a few such centres in Sussex. The mother doesn't have any financial support and says that any donation would have an enormous impact on their family. Thank you.