GG,
Don't beat yourself up over feeling what you feel. You are human. You are experiencing a huge loss. Accept that you will have your down moments. Allow yourself to feel the pain. Then, pick yourself up, dust yourself off and find something else to focus on. Over time you will find that even though the down moments continue to show up on occasion you will pick yourself up sooner and it won't hurt quite so bad.

Hang in there. Life truly does get better over time.

~ swl

Look not mournfully into the past. It comes not back again. Wisely improve the present. It is thine. Go forth to meet the shadowy future, without fear. {Henry Wadsworth Longfellow}