Aww lovely, i totally sympathise with you. It's such a massive thing our bodies go through and partners and hubby's totally under estimate how rough it is, physically and emotionally.
I understand your worries in terms of feeling concerned that you will be able to manage but from a different view point as this is baby number 6 and i worry i won't be able to manage all of them, hubby is not the greatest of help either. This was out only unplanned child so like you i even feel slight depression about the situation and the extreme anxiety.
I get told when baby is here it will all just fall into place and to try not to worry about it although it's easier said than done.
Please feel free to let off steam and let it out openly, just talking about it with someone impartial can really help.
What's your due date? X