I do it too! I thought to be the only one, lol. But I do it with any sentence, also not related to my well-being...also more cheerful things. Don't know if you have it too.
My therapist suggested that I give myself a limit, like I can repeat it only three times and then stop, though I'd prefer to go on. I do it also with other compulsions (I have OCD). This is a quite hard one to control though.