Unfulfilled with my current career

I currently have a Master's degree in Nutrition and I make a decent salary About 40K in the midwest. But although the job is very flexible (i make my own schedule or work from home), I am very unfulfilled. I hated this subject when I was in high school (did not even take it). When I went to undergrad, I was forced to take it since it had more teaching opportunities. I taught high school for 2 years. I then ended up in grad school in the USA doing the same thing--it was the only way I could make it to grad school and did not know much else--I am from another country.

I endured through grad school hating every part of it. It was very challenging and is still is teaching people about foods that are strange to you. It is very frustrating when you are teaching a class about what foods to avoid if you are diabetic and someone asks you about a food that you have no clue what it is. I would say I still don't know about 30% of the foods in US. I hate this career and the subject I teach but I like the flexibility.

I have thought about nursing but my husband has discouraged me from it due to the odd working hours, working holidays and weekends and the stress.

I am now thinking about occupational therapy or nursing. I could qualify for the accelerated nursing option.

I could also qualify for a direct entry Master in Occupational therapy or Doctorate in occupational therapy but the school closest to me costs about $800 per credit hour. The doctoral program is 3 years and the masters is two years. I have 2 young kids but have no student loans currently.

What would you advice?