Do you fear happiness?

The last few years of my life have been very difficult, I won’t go into too many details. But most of my day circles around the issues I am having. Real ones. Also phobias brought on by high stress. If all this reality is removed, and I settle into a place that is peaceful and calm, I am terrified of looking back and understanding how stress almost wrecked my body. For example, eating badly, smoking too much. This almost makes me afraid of impending happiness. Does this make sense to anyone?

It is almost like you were speeding down a crazy highway, with bumper cars and mad pedestrians, then suddenly you are idling down a country lane. Has anyone experienced a change in their lives that went from bedlam and calm. How did you cope? I know this is an odd question, but it is very important to me. Thank you.