Watch the film SiCKO by Michael Moore. It is a documentary about the US healthcare system. After watching it you will find it very difficult to complain about the NHS ever again.
Having been in hospital many times, I can tell you that the NHS is great. I rarely have to wait to see a doctor, and if I need medicine, it could cost the NHS £10 or £10,000, but I will only ever pay £7 for it (I believe the current price is around £7). However, as I am in education, I don't pay anything.
Private healthcare does not cost a huge amount and many large companies give it to their employees and their families anyway. It is good, but unnecessary. The NHS is one of the few things that Britain does right. Stop complaining about it.