Honestly, I think it's a terrible time to get into teaching. There is such a huge glut of teachers right now. Ontario, for example, has been churning out ~10,000 new teachers a year but only free up 5-6000 jobs through growth and retirements. Since this has been going on for a decade, the glut is massive. It appears that most province are in a similar situation.
As for Engineering or Health Care....
I think engineering (diploma or degree) is still a great career option if you enjoy the work. My only suggestion is that it not be geared specifically to oil and gas. It can be a very rewarding career and the pay (even outside the O&G sector) is excellent.
Overall, I would definitely lean more towards Health Care. The population is aging rapidly and the next 30-40 years will see a major boom in delivery. The major downside is if you'll doing the same scan/test procedure 8 times per day for 30 years. Of course, options to grow a career will appear over time....
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