Why do i obsess about my health? every symptom becomes a major disease in my head.

Illness anxiety: It is possible you experience Illness Anxiety Disorder (formerly Hypochondria). While this name might sound stigmatizing, this anxiety disorder can be quite debilitating. Here's a quick screen: http://www.4degreez.com/misc/hypochondria_test.html If positive, consider consulting with a mental health professional about it. It can be treated!