Losing someone you care about is painful. Grief is the emotional reaction that follows. It's a normal process, with both physical and emotional signs. But even with major life changes, such as the loss of a spouse or parent, you can face the loss and move on.
Feeling better won't happen overnight. Know that you will feel better with time, as long as you let yourself grieve. Grieving helps you heal since it is a normal part of the healing process.