Repulsed by the idea of sex..

I need some advice and reassurance..sorry its a bit long.. My husband wants to wait until next August to try again for another baby, he wants 3 years between children and if we tried this year there would only be 2 years difference, and it has sent me into a slight depression.. Now sex doesn't even sound appealing..I feel absolutely terrible about it and I still have sex with him, but all I think of is the ache of wanting another baby. I also start thinking of what needs to happen to have another baby, and worry if it would get done before next year. We need to add on to our house and I'm not sure how or when we will get to that. Now I know I shouldn't think too hard on all this, but I just want to know if I'm not alone in this. Has anyone else had issues with this sudden repulsion and overthinking? (Sorry this was so long, if you read it all thank you for baring with me..)