Caring for adult son with PTSD,depression and anxiety

Hi all,I'm back,after a few stress filled months moving house.My son had fuel poured on him and set alight,he has 75% 3rd degree burns and all the baggage that goes with trauma.He has also suffered from anxiety and depression for many years and it's been very difficult to get him the help he needs.He self harms,and is occaisionally suicidal.I contacted Fluresco here in our area and he has had his first appointment for assessment but we weren't given another appointment as yet,she said she would get back to us when one became available.I am so frustrated that I can't get him the help he needs because they are so booked up.No one can see him.Mental health said he needs to be in dire straits before they see him......in other words,causing himself harm.I have depression myself and can't look after my own health because of the worry and stress of looking after him.Does any one have any ideas?

Thanks.