When did I start worrying

When did I start worrying about my health all the time? It seems like for the past couple of years I overreact to the slightest pain in my body. The worst are the chest pains. I get them and I wonder if I’m having a heart-attack or a stroke. I get nervous about what I should do. Do I perpetuate spiraling health care costs and go to the emergency room? Do I take the good citizen route and just grin and bear it wondering if its serious? In the case of the chest pains I think they are the result of sleeping funny, or nerves getting pinched but I don’t know that when it first happens. Since when did I worry so much about getting seriously ill or dying?