I'm 6 months into my second job and it's destroying my mental health to the point I'm seeing a therapist now. I'm sorry if this question seems dumb or ill-researched but I haven't been able to think straight or sleep much since I started this job. I've realized that my old job was so much better in so many ways. The listing for my old position is still up - it's a very small company so there's only room for one person in that role. The sole reason I left was compensation, but that was just me being greedy - I made more than enough, and the benefits were fantastic at that job.
How should I go about asking if I can go back to my old position? What kind of questions should I be prepared to answer?