If I understand you correctly, you did not complete your first year of teaching.
I am sorry this happened to you.
Depending upon where you live - this could make it difficult for you to resume work as a teacher.
You will basically need to work at restoring your credibility and reliability.
You may have to work at a less desirable school in a less than desirable location. For example, inner city schools typically have staffing problems and a two year stint at such a school would certainly go a long way towards restoring your professional reputation.
Regardless of where you wind up, you will need to demonstrate your reliability by not only finishing the school year - but probably working at this school for a minimum of two years.
With two solid years of experience under your belt and at least a satisfactory recommendation from your building administrator, you should be able to move on with your teaching career.
As an alternate route, you could consider working as a full time substitute. Working as a full time substitute would give you more hands-on experience with a variety of grade levels and schools. In time, as a school administration got to know you, they might consider offering you employment as a classroom teacher.
You could also beef up your resume and demonstrate enthusiasm for teaching by: volunteering your services as a tutor and/or taking additional education classes.
In terms of the stress you encountered as an elementary teacher - one question you will more than likely encounter at any interview will be how you anticipate handling job related stress this next time around.
I hope you are prepared to answer this question because nobody but you really knows your frame of mind.
If I were a building administrator, I must admit that it would be very difficult for me to consider employing you. Having failed to finish your first year of teaching, what guarantees could you give me that you would actually finish the next school year?
The more you can demonstrate your emotional stability and professional reliability, the better off you'll be.
What have you done in the interim to prepare yourself for going back into the classroom?
Have you taken any self-help classes? Have you had sessions with a counselor? Do you belong to a support group?
The more you can show a potential employer that you're reliable and enthusiastic about teaching, the better your chances will be of eventually finding employment.
What you MUST NOT DO is to waffle on this question.
"I will try to do better" is not an answer that would fill me with confidence in your abilities as a teacher. It's a bit like that sequence between Yoda and Luke Skywalker where Yoda bangs his stick on the ground and says, "There is no try. There is do or do not."