NHS treatment

I was wondering if it is all about my bad luck or it is just reality. My son is 4 years old and has been diagnosed with ASD. He has sensory processing difficulties too. I remember that after a diagnosis what we received was a leaflet with information about the disability and nothing else. Luckily we have S&L therapy sessions but it is every three months?! Today I read that: "Experts believe that the first 5 years of the
child's life are the most crucial and that is why
intensive help before school is important,
although intervention at any age is beneficial.". My question is: who is responsible for that intervention in this country? Rich parents who can afford private treatment? I fight for better life for my child and NHS specialists say that they cannot help me because of long cues or lack of government funding.. Does it mean that this country leaves us with no choice? I am so disappointed and do not know what to think about it whether it is a problem that we are not British or it is the same for everybody living here in the UK. Maybe I am wrong, but I feel that you fed up with immigrants and it is understandable. On the other hand everyone should be treated equally because it is not our fault that our child experiences such difficulties. Every parent wants to have beautiful, healthy children..