I have had pain in my upper left leg for several weeks now. When I spoke to my GP (by phone) he said it sounded like a trapped nerve and to take painkillers. I now have quite severe pain in my right knee, could both these things be arthritis?
Yes, it would be appropriate for you to be examined, either in person or TV.
If you have left and now right sided pain, I would suggest that you have an evaluation of your lumbar spine including an MRI. It would be unusual to start with a left thigh area pain and later develop a right knee pain due to arthritis. Alternatively, a spinal stenosis in the lower lumbar spine due perhaps to a herniated intervertebral disc can give you both areas. Please consider this option. Good luck!