Neither DH nor I have particularly high sex drives. Since DS was born 16mo ago, we've had sex twice
both in the last 4 months.
Initially after DS was born, we agreed to ttc#2 from May 2010. We got to May and DH told me he was too stressed at work for a couple of months due to workload which would improve. I was disappointed but tried to be patient and DH agreed to ttc from August.
We also had a big discussion about finances as he said the pressure of providing for the family was adding to his stress. We talked it through and I tried to reassure him. We are both on decent salaries with combined annual income of >£100k but DH does worry about his traditional role of "provider".
The month of August coincided with his parents staying with us for a week and DH wasn't happy having sex with his parents under the roof.
This month, he's told me that he does want another DC, he's just in no rush and is still worried about finances. We talked it through again this morning and I told him about some guaranteed bonuses I would be getting in the next 18mo and he asked when 9mo from now would be and he said that it actually would potentially be ok. I decided tonight I'd cook his favourite meal and "jump him" 
Then this afternoon, he fell and his knee popped out of joint briefly. Now he's in pain and has gone to bed early!
I know I sound very unreasonable and should be sympathetic and patient but it just seems like one thing after another! Originally we were ttc from May and now in September, I feel no further forward!
Can you tell me whether
1)DH is being unreasonable in anyway
2)how to get the whole ttc thing into perspective as I'm sure a few months really won't matter!
3) any other advice (or just a slap if you think that's in order!)