I don't know much about BDD but I don't think we should be assuming we know the gender of this poster nor whether or not he/she is unattractive and needs a makeover. Definitely not the latter.
To the OP... I don't think I would be much help to you other than to offer an opinion that this is deeper than any positive affirmations or positive reinforcement will help.
I agree that there is more of self-loathing in this than there is dissatisfaction with personal appearance.
I've spent the greater part of my life struggling with vanity and as odd as it may sound, there seems to be an element of vanity in BDD so I think I will leave the thread now, but I wish you well.