I agree with your therapist about the label - that is not the most important thing, but is she helping you deal with it at least? Maybe in small, baby steps?

Wow, would an inspection really take that long? How many sprinklers do you have?! I would just open up all windows if possible and try to stay a safe distance from the people (surely it doesn't take 3 or 4 people to inspect sprinklers?)

Genuine question, why do you wash your hands so much if you never go outside without gloves and don't touch anything inside with your bare hands? I'm sorry I don't know much about OCD, but I would try to challenge your beliefs that you NEED to do these things. Figure out which things make sense to keep yourself safe and what doesn't.