I'm so sorry for your troubles. It is good that you are now doing better.
Being an MD is not for everyone. Many NPs could have gone to med school but chose the nurse practitioner route instead. A reputable NP school is not easy, but it is easier than med school. In addition, there is more flexibility - you could go to NP school part time if that works better for you.
Just make sure your depression is well-controlled before you start school and that you have a good support system in place if your depression worsens while you are in NP school. I also struggle with depression and it did get triggered in NP school. Fortunately, I had an excellent academic advisor and faculty who worked with me and helped me succeed in school. Make sure you have access to a psychiatrist and talk therapist and regular appointments. Most schools have student health services for this.
At my school, the faculty and fellow students were very supportive, reflecting the nursing mindset. In addition, the school placed a high premium on everyone graduating.
As for what NP school is like, I went to a top school and chose Adult and Geri Primary Care. I was full-time, and took 24 months to complete the MSN. This can be done in 15 to 16 months, but I didn't want the stress of that. The first semester was didactic content, along with clinical skills in lab. The second semester was mostly didactic, with only 24 hours or so of clinical - one day a week for like 6 weeks or so (I don't remember exactly). For the rest of the program, we had both didactic and clinical rotations, and the clinical time worked out to about 1 to 2 days per week per semester. I studied 6 to 8 hours a day on non-clinical days, including weekends, on average. A lot of that was because we had to do a lot of writing. Obviously, study time will depend on how fast you learn.
A lot of students worked as RNs full or part time, except for the last couple of semesters, when everyone switched to part time or stopped working.
There is a very high demand for PMHNPs in the Western U.S., so you would have no trouble getting a good job after graduation. Out West, we say finding a PMHNP is like finding a needle in a haystack.
Some of your med school classes might also transfer over.