Please, please help

Hi there,
I hope someone can offer advice here:
Since I was around 13, I have masturbated over other men.
But it's not as straight forward as that.
There was a group of around six boys in my school who I masturbated over - and have ever since, as in what they looked like back then - plus two or three guys from TV. I never actually fantasies having any kind of anal sex with them or have any interest in their penises, more I am fixated on their nipples and of them licking each other's nipples.
Odd, I know.
Growing up, I mainly watched lesbian porn and mainly wanked over that and women, in general. I kissed girls, dated girls and had sex with girls.
My anxiety got so bad about it two months ago that I saw a pyscologist and my anti-depressents were upped.
She diagnosed me, after I told her about my past, as having generalised anxiety disorder with OCD.
Unfortunately, my wife found what I had been researching and went hysterical.
I assured her that I loved her, which I do, and that I would not run off with a man - or woman.
She came with me to the psychologist, who calmed her down and said that there was nothing that unusual in married men having these fantasies.
She seemed to accept that.
But I am constantly questioning myself and my sexuality in my head, constant thoughts going round and round and round and, when I do masturbate, if the thoughts of those boys from school come into my head and I ejaculate, I feel worse. And, even when I'm feeling calm, I can still feel "the thoughts" in my head, like its never, ever going to go and it's going to drive my insane.
Even when I'm having fun or a good time, I soon realise the thoughts are still there, in my mind.
I don't have any interest in wanting to have sex with a man and I lust after women, so maybe it is just a fetish for nipples? My psychologist said they are just fantasies, which all men and women have.
It's also had an affect on my sex life - my wife has never had a high sex drive and mine wasn't that high, probably because of years of being on antidepressants.
We are due to go on honeymoon next month, but I am so scared about having the racing thoughts and anxiety when we are there, that it will ruin it.
My wife has also noticed how unenthusiastic I am about the honeymoon.
Can anyone help?
Thanks.