Hi Couldnttakenomore
Firstly well done for reading the email then deleting it, that shows the strength that you have, maybe consider blocking his email address as well in case he sends you more. Also its normal to be missing him and wanting him back, this man has been the centre of your universe for probably a long time so to suddenly be without him is a shock to the system. Like KIP said read up on as much as you feel able to, look up trauma bonding and these are some books that are really good at explaining what you have been through.
Living with the dominator by Pat Craven
Why does he do that by Lundy Bancroft
Coercive Control by Evan Stark
Take each day as it comes and we are here on this forum to support you.
Take care and keep posting
Lisa