history: I was really stressed out and grad school and had no choice but to drop out to keep my sanity.  I was really stressed out and grad school and had no choice but to drop out to keep my sanity.
current: Good choice. You're health is more important than some grad degree. 
next: That is what I was thinking at the time, but I've been having a really tough time finding a job where I can advance into a higher position. I always seem to get positions with no mobility.