When my grand mom died, I went through the same thing. I had known her for over 30 something years...
I was AFRAID to grieve my loss. As a result, I became depressed. When I went to see a doctor, he told me what I already knew, that I needed to ALLOW myself to grieve.
Grief/mourning doesn't go away overnight, but I asked myself if my grand mom would have been happy with me walking around in a funk like I was.
I realized that it would have made her terribly sad to see me that way, so I allowed my heart to grieve for her. Weeks passed, then two months... .
Here I am, 8 years later, and jut a month ago I walked into my kitchen and wept because I was talking to my daughter about something and it reminded me of grams.
Don't focus on yourself during this time period. Focus on the needs of others (I was fortunate to have my daughter (who was much younger at the time) to focus on so caring for her typical adolescent/teenage needs took my mind off my grief.
I also spent more time with my mom making sure SHE was ok. And then one day, it dawned on me that I hadn't thought of grams for a minute, because I was busy with everybody else.
Ask yourself this question: How hurt would your husband be if he saw you this way? Honor his memory by doing what you know he would want you to do: Live life and enjoy it.
It gets better, with time.