Hi, this is my first OP - nervous!
Over the last few months I've noticed a strong smell of petrol/exhaust in my house. I assumed for ages it was just coming in from the street but my husband can't smell it. And actually, I live in a cul-de-sac, very quiet! At first I could only smell it in the evenings but recently it's become more common and stronger. At night, when I'm lying down it changes to a smell more like burning.
I've had a look on google (I know, I know) and there are suggestions of anything from stress to brain tumours
. I have now stopped looking at google 
Has anyone else experienced this? And do you know if I should see a psychologist, my gp or an ear. nose and throat specialist?
Many thanks to anyone who is able to help 