I would encourage you to do more research on this career, possibly even shadow an OT or two. Look at job postings for a few months and see the salary ranges. If the salary increase would make it a break even or better proposition, it could be worth it. But only you can know if the career interests you and will be fulfilling.
My sister is a Speech Language Pathologist (aka a Speech Therapist), and her issue with OT is that, while it can be helpful, is not a mandated requirement for schools to have them in the same way they need to have an SLP (maybe that's just in our state, but you could do the research). It's also a similar debt load to an SLP degree without as much career opportunity (SLPs can work in hospitals, nursing homes, schools, early intervention with babies and young children, clinics, private practice, and can be generalists and work on a variety of issues, or specialize in various areas--swallowing, stuttering, accent reduction, etc.). I would strongly encourage you to look into a variety of medical-related fields and their career potential before deciding on grad school.
I also want to add that if teaching burned you out, OT or another medical field working directly with patients may have some of the same issues. It depends on which aspect of teaching burned you out--was it the long hours and high expectations, was it all of the student/classroom interaction, was it administrative BS, etc. Some of those will be issues in any career where you have to talk to people (read: most careers).