The term "sex addict" and "sexual addiction" are somewhat controversial in that there is arguably no physical addition as there can be with some drugs. However, even those who criticize the term do agree that it can be a compulsive behavioral disorder that shares some of the common traits of addiction. But in either instance, I think that the key is to get help. I would suggest that you seek a referral from your primary physician to a psychiatrist. In all likelihood the psychiatrist will visit with you and either refer you to a good psychologist or treat you in conjunction with a psychologist or counselor. But if you're having difficulty quitting, I think professional help is the way to go. If you have insurance, it may be fully or partially covered. If not, you'll still come out way ahead paying out of your pocket compared to what you're spending on the hobby.
Here is a web site for an organization that list counselors for therapy in this field:
http://www.sash.net/
(Note that they apparently do embrace the addiction paradigm, if that makes a difference to you. There are five therapist in the Dallas area.)
You might also check out this link:
http://www.santecenter.com/about/sta...tml?staff_id=1
I know nothing about any of these organizations or professionals, but simply did a Google search. I don't endorse them as I don't know their reputations, but this might give you a place to start.