Have you tried alternatives ways of handling this like meditation ? You can watch/listen to some on youtube, just look up mindfulness meditation. Otherwise a walk at lunchtime in a park or green area can calm you down if you're feeling anxious, as well as exercise so gym/cycling, anything to get the heart going and oxygen into your bloodstream. Also do you know or understand what situations are making you feel like this ?
Giving up your job is a step back, so try and look at how best to cope/tackle this.
Good luck and well done for getting back to work, you should be proud of yourself