I've been really stressed lately. Does it ever happen to you that you eat way too much when in stress?
Sometimes.  I am definitely more impulsive when I'm stressed out.
Me too, I just act on a whim when stressed sometimes. however even though stress can be horrible, sometimes it may be beneficial too, for example in competetive situations.
I agree.  Sometimes stress can help me be more motivated as well - if I have an upcoming deadline for example.  
It does play a role in motivation, as well as adaptation to the environment. I myself started thinking of stress as a more positive thing, in the past I used to only focus on the discomfort.
In what ways has it been positive in your life recently
Lately my wife and I have been apart for work related reasons, I decided to take on eudaimonic perspective, in psychology it's the concept of a "good life", living according to greatest values in life, and thought to myself the stress motivation can help me finish up working faster and come back to my wife while appreciating I have a job.
That must be tough - being away from each other for extended periods at a time.  My girlfriend and I had to spend two years apart while I studied abroad so I know the struggle.
Yeah that's hard.  But it's important to still focus on your well-being, happiness and contentment and making most of this experience in such a situation.Besides, it makes the relationship stronger.