How can i decrease my stress , i am very emotionally and when see a sick i feel that illness in my body and then that time i feel exhausting help me?

Stress reduction is: pretty standard these days, starting with good sleep, diet, relationships and productivity at work/school. To that, add meditation, yoga, avoidance of drugs/alcohol. To that, add awareness of your thoughts and their physical/emotional effects. If you have a high level of empathy or are prone to hypochondriasis, seek out a psychologist for a little CBT.