I couldn't agree more with the comments. It's amazing how much paying attention to physical and psychological ailments makes a difference. The OP might want to

I couldn't agree more with the comments. It's amazing how much paying attention to physical and psychological ailments makes a difference. The OP might want to look into neurofeedback for focus/peak performance. Disclaimer: I work as an EEG Technician,and also write software for neurofeedback systems. This is not medical advice.