Whining - health/cost

Sometimes I have doubts about certain explanation for health care, assuming anatomy is differently determined by their unique biological creation:) But, my uncertainties often turn out to be just axiousness. I have examples of health problems, and many of them clrealy show my distrust:)
Backpain
I had backpains. Concerning about it, I went to several doctors. First I complained of it to a doctor in Budapest, she said it is a normal to have a pain and just pursue an active lifestyle. It continued over a year. Another doctor in London, told me everything is OK.
Eye sight
I got an eye-sight check at University Vision Optician in July 2008 while I was at UoM. Feeling unconfortable, I did not wear glasses for about half a year after that. Then I got checked in Happy, an optical shop in Ulaanbaatar which was January 2009. Despite my doubts, the results came out the same - in UB, an optician used only a coputer machine.
Then my eyes got dry and itching in February 2010, I thought my eyes got worse. So I went to a doctor - he reviewed comprehensively- tested sights, checked with computer, test-ckecks (walks etc) and microscoped through. Everything was O.K.
Knee pain
Something went worg with my knee after a day long hiking in forest mountain. Sergey and I set goal to reach a top of Bogd Uul from its back, where the hiking path dissapears only in the downhills. Luckily we reached our dream. There was a point I wanted to stop becaus emy legs were hurting too bad, but I kept going - no-one for help and I didn't want to cause trouble for my friend. Once we reached back UB, I could not get up and my right knee was all pain for streching and touching - note no swallaw. I went to a clinic of injury in UB, a doctor told me it is nothing - perhaps be my throuht ? - no idea. Due to busy queu, she refused to look at through X-ray. Steve, my friend who was visiting me from Korea, was shocked. A day after I went to an another clinic, a young doctor told, without X-ray, me it was injury of ligament in my knee. Then she wrote a cream to apply and adviced to have physical treatment for two weeks - which I was unable to do. The pain went two days since I applied the cream over.
That symptom occured to me again when I was running for a maraphon in Nishinomiya October 2009. So I went to orthopedic, he questioned and screened through X-ray, he said my bones are good, perhaps the pain was from ligament ingjury. He shot a dose in my knee and wrote a prespription of cream to apply. I applied the cream, which smelled strong mint. The pain went away within 3 days. He was right.
For above examples, my firs thought was to see a doctor. Trusting what he/she says really varies. I have more confidence in a doctor who explains with a tool such a X-ray. Some cases, a doctor was right without a tool. I shared my views with my mother. Her response was that she never went to a doctor to complain besides delivering her children (including me).
Oh on top of that, speaking of cost seeing a doctor in Japan? I paid a hell amount to the clinics for simple diagnosis. I am happy for paying extra because I trust the results are right. which is opposite in Mongolia. After all, I also think my uncertainty indeed result in extra costs which I might have not worried of!