I'll come and sit in your corner.
Fell pg with dd the first month of trying and so foolishly assumed no2 would be just as easy. 20 months later and still no dc2. Have seen a GP who told me they would do tests after 2 years of trying, but that I was unlikely to get any help whatever the tests showed because 1) I have a dc and 2) I was too old. I'm 35 - it's the first time I've been told my age is a barrier in quite that way!
We are readjusting our thinking. We are no longer actively 'trying', in that I don't watch charts, or factor the non-existant baby into holiday plans any more. I am trying to see dd as the completing of the family, rather than being half of a complete family with the other half missing. I have stopped calling the spare room the nursery, which I only ever did in my head, but even so, I don't any more.
We have not stopped trying in the sense that we don't try to prevent it, and there are certain days when I do think DTD would be a good thing so I engineer it, even if DH doesn't know why he's getting lucky that night!
I am trying to learn to be delighted with what I have and not think about the person who isn't here who I think should be. I cannot stop myself looking at people who have infants who would be about the right age if we had conceived fairly quickly but I try not to convert that into 'What would my baby be doing now? Learning to pull themselves up on things? Learning to wave?'
DD is nearly 4. It's a much bigger gap than we wanted but now, I will just be thankful if we get another and not so concerned about how many years between them. But yes, it gets harder and harder to be happy for people, or more accurately, to hide the pang of jealousy. One friend of mine only wanted one but fell pg again by accident and got twins, another is expecting her second and her first is nine months. that is particularly hard - her first was born about when we would have been expecting dc2, and she's managed to get not one but two in that time.
It's interesting there are so many of us, and that the standard GP response seems to be 'Well everything was fine once, so it will be again, just keep trying....'
Wishing you lots of success, at least we've all got company on the road!