It's a fxxxxing nightmare, that's what it is.
You will get through it by doing a lot of exercise - daily - every morning down the gym or in a class or cycling hard or swimming, and yoga at night. You will get through it by remembering who you are as an individual. You will get through it by looking up and seeing other guys' eyes meeting yours and slowly becoming sensitive to the outside world again.
The quicker you can accept the material boundaries of your world are changing - your bedroom, your home, who you call (i.e. not him any more), etc. - the better.
And also the quicker the better that you realise that you do have one very solid, amazing, wonderful person who will be with you always, on whom you can always depend, and who totally loves you - that person is you.
You have yourself. That's the most important thing. So love yourself, work on yourself, appreciate yourself, focus on yourself. You are the only thing that you're taking with you here. The house and the rest of it and him - it's barrelling into the past, so let it go. Look forward to the new era. Embrace it. That's pretty much the only way to go.