I am so sorry to hear that you are still hurting so much.
It is still very early in the period of grief, and it will take some time yet for the minute-by-minute pain to recede, it will, but it does take time.
What will happen is - you will find that as days go on, the raw grief recedes into a dull ache, but then something will set off the raw agony again - a scent, a song on the radio, a random thought.
This is all part of the grieving process, and there are no short cuts.
So although the pain feels endless and unbearable, it will get easier to bear with the passing of time.
Learn to go with your grief, don't fight it, if you need to cry, or shout, or whatever, then do it, it's good for you.
We are very bad at dealing with death, so we like to forget about it as soon as possible if it involves anyone other than a close relative. That is why people don't ring anymore. They feel uncomfortable, they don't want to say the wrong thing.
My belief is, if you have something meaningful to say, say it, and if not, say nothing - but keep in touch with a grieving friend or relative, it is in this 'getting use to the loss' phase that they need you the most.
There are plenty of kind people on here with direct experience of grief who will talk and listen to you - you are not on your own.