[hncomment]

If you have unexplained weight loss and are concerned about a change in your ability to focus, you should consult with a medical professional about your health concerns, and provide them with far more context. You might also (though not nearly as advisable) seek information from sites and discussion communities specifically dedicated to similar health concerns.

This thread is followup for a story about primary/K-12 school student achievement, and not a good place to get personalized health advice.

Good luck.