I understand completely about the enjoying a good challenge and feeling like you actually did something.
I had always wanted to fly so i left my job working for Wetherspoons as a trainee manager.
I never knew till i left how much of an adrenalin junkie i was. With in a few months of flying my stress levels were almost zero, i gave up smoking, health improved and i felt like i had made a blissful move. I didnt miss the 14 hour days, little time off, the verbal abuse and tense situations.
Now its been over 3 years since i left my last job and i really miss being able to use my brain, to have to complete 7 different tasks all this minute, having people depend on me, being tied to deadlines, feeling stressed!!!
As much as i love flying it is a mundane relatively unskilled job. Unless you have plenty of medical or other emergency events to keep the adrenaline flowing your just that person pouring the tea and coffee ( thats a personal view so dont flame me for it!!) i feel that im not challenged in anyway compared to my last job and my brains turning to mush!!! Its so important to get a good hobby in this job.
I know i need a holiday
You do have your busy days but you need to be ready for the fact that most days your dealing with similar requests day in day out, delays, familes, the obnoxious passenger etc. And while this is a great relief from your previous job like any other career you will soon leave the honeymoon period and realise this is just another job.
You have to have interests outside of this job, otherwise i would have gone spare, i get my adrenalin through sports holidays and playing chicken on the runways on days off......
I wouldnt leave this job yet and dont intend to for a few more years yet. I still enjoy going to work each day, but i see it less and less like the "dream job" and more of an enjoyable past time that i get paid for! I would never return to my previous employer but i sure do miss being worked like a dog and feeling that rush. Just have to learn to get it else where i suppose.