Greetings and thanks for your post. Since he was "opened up" the PET scan was not necessary. I experience the primary side effects of "chemo brain", brain "fog", confusion, forgetfulness, some gastrointestinal "upset" such as incontinence and loose bowels. I wear Depends. My other side effects include restlessness and disturbed sleep. I take naps as needed. I have muscular weakness and balance issues which present a fall danger. My first indication of cancer was falling. I use a walker. I was hospitalized with an E Coli infection. I got Covid twice and my chemo treatments were suspended while I got my second Covid booster and a Flu shot. I don't go in public and when I go to get chemo I wear a mask. I'm not familiar with Durvalumab. I live in Houston, Texas. I assume you have read my post. I often repeat myself. Forgetfulness is another side effect.