S.Q.
Yes, I've done this. But for future references don't say the adjustment was unbearable! Just say you really enjoyed the short-term work and gained a lot from the time you were there, contributed to the organisation in such and such a way, but then you were made an offer that gave you a wider scope for professional,development ( and then you can say, and now I'm ready to settle down and stay with your company until my dying day ;).