Given that Frank is having issues that have to do with the concentration and also tiredness we can say that he is passing through what is called disorganization.
This is what is referred to as the middle stage of the periods that a person who has lost someone would be grieving for his lost one. Thus is the stage where the numbness that they feel from the loss that they have experienced starts to wear off.
At this stage the person that is grieving would need to have their friends and family members around them, they serve as companion so that they can talk to them about the loss that they had and the ways that they feel. the company around the bereaved will help distracting the bereaved person, otherwise the person would feel great emptiness and loneliness inside of them.
Read more on bereavement here: https://brainly.com/question/16877564
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