Day by day my health going too bad..but why? i can't understand

Very hard to say: I am very sorry, but it is not possible to evaluate what is happening to you from that very short description. If you are ill, and getting worse, you'll need to see a physician to talk with you, examine you, and come up with ideas on what problems you have, as well as consider tests you might need, or treatments that might help you. Please arrange to see your physician as soon as possible.