It is funny how the purge cycle has changed for me. Early on -- in my teens, I probably held on to things for days and it would be a number of months from one cycle to the next. In my 20's, I'd hold on to things for a couple of months. In my 30's, probably a year or so. Now, I have not purged in years.
I guess reasons for purging may include guilt, like you mention, but also fear of getting caught or actually getting caught.
You need to make a choice either become comfortable that the fetish is one element of your life and that it is not wrong or bad OR take some specific actions which root out the cause of the fetish and attempt to eliminate it.
I decided on the former and the decision has made my life better.