NooNooHead1981 I understand exactly what you're going through.
I lost my brother to cancer when he was 28. About 6 months after he died I had a massive existential crisis and went into a pretty extreme depression.
My DS1 was only 14 months and I could barely lift a smile. I thought I was coping well with the grief but it really caught up with me. I became obsessed with trying to find out where he was, reading about life after death, and near death experiences, in an effort to know "that he was ok" - he was an atheist and I was terrified that he might be somewhere not being loved.
I then became absolutely terrified of death, of leaving my baby, or worse, him getting sick and having to watch him suffer like I watched my brother.
I went back to my grief counsellor and she helped me through it. Whenever I started to go down the road of "death/dying/oblivion" I was to distract myself with something small but nice, like a piece of chocolate, a cup of tea, a trashy magazine. I had no concentration but each time I distracted myself it helped to not be overwhelmed with anxiety about it and slowly but surely I came out of it.
I found the following sayings really comforting and the bereavement pages here really helped me too.
Death is nothing at all.
I have only slipped away to the next room.
I am I and you are you.
Whatever we were to each other,
That, we still are.
Call me by my old familiar name.
Speak to me in the easy way
which you always used.
Put no difference into your tone.
Wear no forced air of solemnity or sorrow.
Laugh as we always laughed
at the little jokes we enjoyed together.
Play, smile, think of me. Pray for me.
Let my name be ever the household word
that it always was.
Let it be spoken without effect.
Without the trace of a shadow on it.
Life means all that it ever meant.
It is the same that it ever was.
There is absolute unbroken continuity.
Why should I be out of mind
because I am out of sight?
I am but waiting for you.
For an interval.
Somewhere. Very near.
Just around the corner.
All is well.
The caterpillar dies so the butterfly could be born. And, yet, the caterpillar lives in the butterfly and they are but one. So, when I die, it will be that I have been transformed from the caterpillar of earth to the butterfly of the universe
Missing someone gets easier every day because even though it's one day further from the last time you saw each other, it's one day closer to the next time you will.
I hope some of these help you 