I am going to answer on your sheet to make it easier to see where my answers are coming from.
distress- negative form of stress
Eustress- semi-positive, beneficial, or performance- enhancing stress.
Hope this helped you learn that changing distress to Eustress usually involves changing your perspective, or how you look at the situation. Especially, whether you look at a situation as an opportunity/challenge to do more(eustress), or if you only focus on the bad things that "might"(or might not) happen.