Happiness Level

I recently tendered my resignation.
Reasons:
1. I really wanna try other things before I'm too old.
2. My happiness level was at negative due to my job.
3. My health seems to be going down, my cough dun seemed to be stopping...
4. No job satisfaction at all.
5. No promotion aspects. (The boss says I have low potential, so cannot promote me even when I'm doing the tasks given to me which should be given to a more senior officer.)
6. My portfolio these 2 years allowed me to innovate, such that I am more confident of my own capabilities.
Now, I'm feeling both Fear and Excitement. Fear for the unknown, since I've been in this job for 8.5 years. Excitement due to the (hopefully) new things that I'm going to be exposed to and learn.