There's nothing more agonizing in the morning than the few seconds of half-consciousness where the memory of having lost a loved one is absent... only to have it all rush back in an instant. I hated this both when I split with my first serious partner, and when I lost my grandfather. Waking to a nightmare and wishing you were still asleep.
When I wake up, it's respite.
I have a very rich dream life but it is also very much sometimes influenced by dead relatives or current personal life events. For the latter I can't/won't do anything about it but for the first one it has always worked to tell them in my dream "begone, now". I have no bad blood left with those people though so maybe take what I say with a grain of salt and see if you really want to tell him that. Also none of the dead people (and my first dog) who I used to dream of were dead too soon or in a tragedy. I believe my dreams are made up of current events in our life and the psychological state you are in: anxiety, love, hate... those emotions will taint and shape the dream sometimes in very obvious way. Those dreams are also signals to me that I am not dealing with it like I should, otherwise it wouldn't happen so often. There's no escape if I dive in work during daylight and it comes back haunting at night.
I get the sense that you are not being allowed enough of an opportunity to express how bad those feelings make you feel as much as you would like to be able to. And if that’s the case, then I wish for you to find the right means to deeply let it all out, in a safe environment, just so that you would not have to fear each morning about that feeling’s return.
It is such a draining feeling. Let alone the double burden of having to also practice continually the simultaneous dispossession of internal self-restriction. Hope you love strongly again.