I'm similar with the OCD, I have to check several things, often more than once, when I leave the house. I also have a problem with leaving the tea kettle on the stove and getting sidetracked. It is a whistling kettle but all of the walls in my apartment are made of steel reinforced concrete with a plaster coating and I can't hear a thing from one room to another.
The good news is that I live in a concrete building with no risk of fire.
I'm sure it won't be long before we have apps to help us with most of these issues.