The Americans and Allies!
Physicals symptoms of negative stress: headaches, upset stomach (including constipation or nausea), muscle aches and pains, chest pain and a rapid pulse, insomnia, a weakened immune system that can lead to high chances of catching illnesses
Mental symptoms: increased risk of depression and anxiety, increased risk of substance abuse (both drugs and alcohol), panic attacks, irritability, struggling with memory and focus, compulsive behavior, frequent changes in mood
* i provided more than three to give you options :)
This has a nuanced answer. The short of it is he writes to someone he knows where she's from and he discloses Blanche's sordid history. But, there's a bit more to it than that. He makes the decision to do this because he thinks Blanche has wronged her sister and his wife Stella. Thus, he chooses to write the letter and disclose all that he's learned at her birthday dinner. He does this not out of love, but out of anger at perceived slights that he sees between Blanche towards Stella, and by proxy himself.
I think its "Whose" because 'Who's" is shortened for "Who is"