Question: hello Doctor :) I have always been scared of gasses and other enviroments dangers; and sometimes I just cant stop thinking about them so please dont scare me more here, but could you please advice me and tell me if the danger I am thinking about is something to worry about or nothing at all.

Everyone know carbon monoxide is dangerous and car exhaust produce this dangerous gas. But we can't fully protect against this environment gas, while every car in the country runs on it.

Yesterday we were in a car center, looking for a brand new car to buy, and inside this car center ( fearly small ) .. they showed us a car, and they did start the engine inside(gasolin), to show us the backing camera. This was brand new car, and it did run for about 20-30 seconds. And after this we did talk in the same room for about 1-2 mintues. Then we did go out. I didnt felt any strange smells and after 6 hours I didnt feel any symptoms. This morning I feel very tired and I think its because I have been thinking about this over and over in my head. My wife who was with me, dont feel anything and she didn't even say a word about this. When we read on the internet, we can read all the dangerous about this; and I just want to know if this will make any damage to my body or not ? ..