I am so sorry for your loss. I too am struggling to cope with bereavement. What has really really helped me is going on anti-depressants, I don't believe I could have coped without that. I am on Prozac, and believe me, it has made a HUGE difference. Without it I was waking up every day with horrific nightmares, palpitations, and breathlessness, all brought on by thoughts of my loved one's death. Now, while the sadness remains, and I continue to miss them and always will, I am able to function and get on with my life in a way I was unable to before.
For very many years I hated the very thought of taking any "psychiatric" medication that would "mess with my brain". I realised recently that that was just stupidity and prejudice.
Depression is caused by, and/or can lead to, biochemical changes in the brain. These changes are rectified by appropriate anti-depressants. Just as diabetics need insulin, those of us who are depressed for a prolonged period need anti-depressants.
Please talk to your GP and get him or her to prescribe medication.
It will help you cope with the loss.
And eventually you won't need the medication any more.