To Nag

1. (transitive, intransitive) To continuously remind or complain to (someone) in an annoying way, often about insignificant or unnecessary matters.
2. To bother with persistent thoughts or memories.
3. To bother or disturb persistently in any way.

(continually remind or complain): ride

(bother with thoughts or memories): haunt

(persistently bother or annoy): worry