how to eradicate past smaskaras

A monastery nearby my house, where I was about to be ordained and venture into the world of which I have been waiting so long, has now denied me ordination due to my bad habits of reading erotic literature, sensual audios and masturbating -- all of which I want to leave forever. I do go on abstinence streaks, but when something unfortunate happens to me(an incident or mishap that saddens me) I get triggered and relapse.sometimes even the most simplest of natural phenomena such a blossoming flower can be the root of the lapse.other times it's just plain advertisements on t.v which cause the downfall.it has become tedious to avoid triggers, it also leaves no time for meditation and other stuff. Due to the kind advice of ven. Yuttadhammo bhikkhu I have quit my porn viewing addiction, but I can't seem get enough of masturbation and other forms of pornography(though the frequency has been significantly reduced)I request the members of this forum to provide some comprehensive techniques and advice that can be adapted with a practical approach and help me quit all these bad habits forever. It has ruined my life to such an extent that I longer feel the state of bliss that I used to have during my abstinence streaks(i now recognise they were the best period of my Buddhist training) P.S: if possible, do explain in detail how to inculcate "sila" in my practice, because @Dhammadhatu mentioned that a proper practitioner has to practice three methods of lust eradication (I have attained mastery over the other two).