He is sly and tricky, the menuval. He plays these type of games on us addicts all the time. Don't let it get you down, just realize that it's HIM, it's the addiction, it's not YOU. You are a holy Jew, with an illness; a spiritual cancer. Get angry at HIM, be determined to do whatever you can to beat this. And when you do YOURS, Hashem will do HIS - which is take away the Yetzer Hara and give you sobriety. You are already doing great with the strong filters, and 50 days is incredible. Keep davening, read the handbooks, read the daily chizuk e-mails, post here on the forum, etc... that's YOUR part. And trust that Hashem will do HIS.