Ok back. First of all, to the posters who have said I'm lucky to have any, I do appreciate that. This doesn't mean that the longing for one more goes away unfortunately, I'm sorry to all those who are struggling and think I should count my blessings, I don't mean to upset anybody.
Trying to answer a few points; We didn't agree on a number really, we were both in agreement that, if we could, we wanted DS1 to have a sibling. If we had another, our marriage would not struggle. I do believe this. DH has said in the past that if it happened, we would cope, but that was some time ago, just after DS2 was born.
claudedebussy - thanks for your thoughts. I hope your stress levels improve!
LongingForLamu - thanks. glad your friend kicked her idiot DH into touch
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JamieandtheMagicTorch - he knows how I feel. I've talked about it (might as well have talked to the wall, I'd get more of a response!). He just says no.
Expat - you find a way to afford a child, I think. If we'd sat down and looked at the cost of raising a child long term, I doubt DH would have been so keen to have even one. I don't think there are many who are totally realistic about the costs of childcare (unless they have a particular lifestyle they are very keen to maintain).
Second DC came about because we both felt that, if we could, we wanted DS1 to have a sibling. DH very much wanted a child, I didn't, we both wanted 2, only I want 3.
Yes, he's discussed having the snip, I don't want him to, although I haven't said this.
Scottishmummy - no, I'm not massively keen on what I'm hearing!
Sorry if I've missed some replies, there's been a fair few posts. Thanks for all your responses.