Hi
This morning, on my way back from the supermarket on foot, I was convinced that our car (which was on the drive outside our house) was being revved as I distinctly saw smoke coming out of the exhaust pipe. I was even convinced that someone walking up the pavement at the same time as me stopped to make sure the car wasn't going to reverse into them.
So I thought that h was in the car revving it as it has had some problems lately. Only to find h sitting on the sofa, and the car (when I went back to it) locked and empty. I had not looked inside the car before going inside the house.
So I asked h whether he had been revving the car and h came out a bit shocked, to see the car locked and empty etc... He then asked me if I was losing it 
. However I too then wondered this and felt shocked and upset. I googled delusions / hallucinations and a whole host of unpleasant things materialised in the search results. The nicest of which was that hallucinations can occur if people suffer from a chronic lack of sleep. I am tired all the time, and I was coming back from the supermarket before breakfast so still, I suppose, in that pre cup of tea stupor?
I have also been feeling down about the loss of a friendship (h has been building an extension for family friends of ours and the relationship has catastrophically broken down due to lots of different things, not all of them resolved, and they still owe h between 3 and 4 grand) and the fact that I am no longer on speaking terms with this mum and dad at school when I see them in the playground. I was additionally really annoyed (maybe shouldn't have been, not sure) that h has almost as good as ordered a new car for us without saying anything to me. Would these kind of anxieties (which don't sound that bad really, when you think what people have to go through) be enough to trigger a delusion of this type?
Could I have dementia (frightened)?