That's one of the hardest stresses to avoid, but avoid it you must. Stay detached, don't let things get to you. Remember it's all just "little stuff".
I also find that if I am keeping my sleep, food, and exercise level and healthy, I am more able to shake off emotional upsets.
Hang in there!
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2000DIAGNOSING LUPUS & HW's LUPUS 101
"Life is far too important to be taken seriously." - Oscar Wilde