You poor thing!! Vent away my dear.
You are doing so well to have put up with it for this long - I couldn't even stand DH in the same room as me when I was as far as you.
Your DF needs to understand that YOU & your baby are his family now. Yes he loves his mum, but you are his top priority. If you want to cry everyday, spend hours in the shower, not get dressed or get off your bum (which was me in the last couple of weeks of pregnancy!!) you should be able to do so.