For some people, three to seven years is nothing. Blink of an eye. And if the cause is what they care about, they'll be concerned, incredibly so.
Why is your mind more difficult to tamper with? You've been possessed once already. It doesn't take much to rid a person of vervain and compel them. Other vampires can do a glamoring thing that can't be protected against. Telepathic powers exist in other worlds. Are you truly immune to all mind effects?