Knee Pain For Two Years

This is my first post, and I am 16 years old, so please bear with me!!

Around two years ago, I sustained a knee injury when I was playing ringette, an ice sport similar to hockey. I was tripped, and landed directly on my knee, and when I stood up, my knee gave out. After a month of pain, I seen a doctor at a local hospital whose expertise was knee injuries. The doctor yanked my knee every which way, causing a ton of pain, then dismissed me in an disrespectful manner and said, "You're fine. There's nothing wrong with you." However, I know there is damage that was not properly addressed because if there was no injury, I wouldn't be in any pain. 

Fast forward a week, and I did some physiotherapy and continuously did exercises to strengthen my knee, yet I still had pain. But last year and a year after the diagnosing of the injury, I yet again injured my knee. Rarely ever do I cry when I sustain an injury in ringette, but I cried when I injured my knee. Both times. I had no use of my knee for a week before going right back into strenuous activities.  

I have had constant pain in my knee that worsens with physical activity, and I am considered an elite athlete, so quitting sports is not an option. I have fallen down because my knee gives out, and I get the pain deep in my knee, on the inner parts of my knee and all around the front of the knee. 

I want my knee to get better, so please give me some ideas of what my injury could be so I can deal with it immediately, and I don't want my knee to be any worse than it is now.

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