Thank you all. I didn't post and run - I just limit my online time at home and over the weekend I was off the computer. I'm sure you all understand.
Now that I'm back at work I read the rest of the replies. I have to say I'm convinced I need to tell the full truth and prepare for the consequences. I appreciate all of your words of advice, particularly the advice on how to prepare for the conversation. It may still be a while until I tell (meaning a week or two) due to some things coming up, but I do plan to tell all. I make myself sick and I wish I was someone else, but this will be the start of that new person.
Thank you all, sincerely.