Autism,When is enough , enough?

I have my son in just about every therapy i can think of and doing extra things too. he is in discreet trials , occupational therapy, speech therapy, sees a pediatrician often and takes medicine. now when do you add the gfcf diet or the supplements? should I check into chelation or is it just what life deals us? I am really thinking some of this is chasing rainbows. Nothing seems to be the cure for autism yet everyone has an opinion but nothing substantial, I am a mother with a severly autistic 6 year old. What have you seen proven that will work? Is it the cure? Did it change someones life and is it strong enough put hope in a broken heart? I will never give up and I am strong but I am also tired of maybes I wanna know who saw what, that really helped a child with Autism. Are you not tired of ideas but nothing real? I know I am.