Housing/ homeless

Hi our family are being kicked out if our home it's rented and our landlady wants to sell all her properties we lived I  her houses for 9 years she sd the last house we lived in we took this because the council said we would be homeless ok then she said if it wasn't for covid she would if sold up 6 months after we moved in my sons 16 just got his diagnosis for asd and struggles to trust people or go out it's difficult for him to access support because he struggles with this and now we're probably going into a b and b and it's absolutely stressful for him his anxiety is high he's having meltdowns daily now we're really worried because he's told s a.l.t.he wants to die we're now on chams for a pediatrician to see us both what advice could anyone give me because my son needs to regulate himself and feel safe and secure I've been to our mps the council are useless