Aprilrose I assume from your comments about the NHS that you have private health insurance and can afford to pay for private doctors.
Perhaps you are unaware that if you have a dread disease, such as cancer, you may go into remission but, if it recurs you are usually no longer covered. That is what happened to neighbours of mine and their son. A young man who developed lymphoma (I think - some sort of cancer) and was treated privately. He went into remission, had regular checkups - all clear. Then, shortly after a checkup he became ill again - no more private treatment and so it was the NHS that took over. Sadly he died but his parents, who were very pro private healthcare, could not fault the NHS.
Peoples' experiences of the NHS differ but IMO they are excellent, especially when serious conditions are involved. It may be necessary to wait several hours in A &E sometimes.
That happened to me on one occasion when I had a severe asthma attack. I was taken by ambulance to the resucitation area and all the bays were full. There was a stomach being pumped in one bay, a heart attack in another and I don't know what was going on in the other two bays. They treated me and whilst i was waiting I could hear them talking about the cases coming in. There'd been a pileup on a motorway (I forget which - it was over 40 years ago) and a major fire in an old peoples home and they were waiting for the ambulances to arrive. I was moved to a different area, possibly a corridor and left for some hours. I didn't mind because I'd been treated and was recovering and the staff had a lot of more serious cases to deal with.