Hi MabelMay, have namechanged for this, I hope you don't mind me putting my twopenorth in.
I've been reading this thread with interest, as I can relate to what you are going through. I would say I'm about five months on from where you are now, although things with my OM went a lot further. We never had full sex, but did plenty of things we shouldn't, were involved for about a year and to be honest, loved each other a lot.
I'd had a very rough time in my marriage, and my dh wouldn't listen to my distress. I think I was at such a low ebb I couldn't make good choices. Or rather, I could have, but I didn't 
Anyway, I won't bore you with my story, but I just wanted to say that in the end I told my dh everything, and I'm sure that's the only reason I managed to break contact for the final time. That was back in May, and there has been no contact since early June, when he did make contact with me and I told him the situation. Needless to say, he disappeared like a rat up a drainpipe, and that was that.
Since then dh and I have been working on our issues, having counselling and things are starting to look up.
BUT
The last few months were so, so difficult. My counsellor said I was grieving, and I know that there are ladies on this board who have lost husbands and children, and I in no way wish to compare my pain with theirs, but that is what it felt like. I was drinking too much, felt like I was walking around with a stone on my chest, couldn't sleep, couldn't stop thinking about OM, I was just obsessed. I relate to so much I've read on here - crying in the shower rang particularly true.
I thought I would never get over him. Then, last week, everything came to a head. I had two days when I just could not stop crying -couldn't get out of bed. I think a counselling session where I just gave in to my feelings and told it like it was was the catalyst.
And since then, it feels like the sun has come out. I'm not saying I'm over him, just like that, but that sick feeling has gone, and I can think about him fondly but also realistically. I no longer feel the need to check emails and read his Friends Reunited profile
every day just to see photos of him.
I can feel the bonds breaking, and the ones with dh restrengthening every day.
I just wanted to let you know that I have been in the pit of despair with all this, but now it is passing, and it will for you.
Be brave 