I've been having the same sort of fears, but mine have been more like how will i cope, how will the kids adjust, will we be financially ok etc etc etc.

Its just all normal fears, i just tell myself that we will manage, things will be ok and thousands of others do this too.

as for my Dh i will be putting him to great use this time around, he will have to have cuddles with bub so i can cuddle my very attached to mum 4 yr old, and then there are times when im sure the other 2 will have him so busy we will all colapse in a heap at night.
Its good that you are having these thoughts as it shows you are preparing yourself for the new arrival, as scary as it may seem now I am sure you will do fine, and you have loads of support on here to make you feel like your not alone.

Best wishes for your new arrival