You're definitely not a lunatic! I've got a friend who does it. They didn't know it was OCD until we were talking about it and I explained what it was.I admit I've retraced a route to check I've not left someone in the road. Or obsessively check my mirrors for people following me, because they would stop to help someone. Feel like a lunatic now, this is the first time I've 'spoken' about it.
I definitely show less of this behaviour now I'm on anti depressants.
I've experienced a version of this particular presentation amongst others, along with various lower level rituals, obsessions and intrusive thoughts since I was little. I've never sought 'professional' help but I have learnt a lot about it over the years in order to help myself. I've never told anybody the extent of it except my ex husband who then used it against me in various ways which put me off explaining it others.
The worst flare up was when my thyroid was overactive. Which makes sense because that raises your anxiety physiologically, higher heart rate etc but God it was bad. I became really paranoid I'd drop my baby out of the window, to the extent I used to creep around the bedroom with him, leaning against the bed and insisted on all the windows being locked. That baby is 12 now but if I think about that time I'm right there in it if that makes sense? I've never told anyone else that so there you go, we're sharing tonight x