Hello, My 12 Yr Old Son Has Extremely Large Tonsils

Hello, my 12 yr old son has extremely large tonsils although they never get infected and do not cause him any pain. However, he does suffer from frequent fatigue, inability to concentrate, extremely slow processing, and increased thirst as compared to our other three children. He also has moderate dyslexia. Are any of these symptoms related and would warrant a tonsillectomy?