How can i strengthen my nevours system ? it has been three months that my body don't feel . and my heart keeps on changing many times a day lose sight memory weak?

Having a hard time understanding you questions. Complexities such as yours need deliberate and focused evaluation and you will require full history and examination to allow further decisions and intervention. A diagnosis is required. You cannot do this on your own, see your doctor and commence.

I am sorry you are having so many symptoms. I would start with your general pediatrician or family doctor for a thorough history and physical. Write down any symptoms you are having and with the timing - start, how long, getting better or worse. The distress about unexplained symptoms can elevate a young man into anxiety and worsen the heart symptoms. Best wishes.