Where can I be hypnotized and will it work?

You'd be much better meeting with a therapist and talking through this to determine WHY you're so obsessed and can't let go. Otherwise, you're going to keep getting yourself into the same situation and choosing the same type of men. Hypnosis can work, but I don't know that it would work in your situation because it's not enough to just forget the one guy. There's more to the root of the problem. Many psycologists also provide, or can recommend, a good reputable hypnotherapist. The home hypno programs don't really work. Especially not for something like this.