I am a thirteen year old violinist, violist and pianist. Lately I have been playing a piece on the violin with very very high notes, and for about four or five days have not been able to hear anything in my left ear. I did have a cold when I first lost my hearing in that ear, but the I no longer have a cold and still cannot hear in my left ear. Also, when I was playing the piano today, the high notes were making the left ear that I cannot hear in "ring", and it was a painful sound.
I have been playing the violin for about eight years now.

So have I lost hearing in my left ear permanently? Did I lose hearing because of the violin? Or was it just because I had a cold?

Thanks.

Or was it just because I had a cold?
Sounds like the most likely explanation as this would cause hearing issues anyway.

No playing the violin will not make you go deaf, The one my one neighbors plays I wish I was at times.

It most likely is the cold, perhaps a ear infection or other issue. But it is time to tell mom and dad and get into a doctor.