Is this a student loan? Or commercial loan? It sounds like a commercial loan. Is it possible to take financial aid money to pay for this loan and live cheaply? I would max my financial aid and pay off the loan or pay it off as much as possible. For example, if my school/living expenses were about 35K, I would max it to about 48K and take the additional 13K to pay off credit card debt. I would rather have my debt be in the form of student loan which you can then pay off in a 30 year form post graduation at a lower interest rate.
It is completely up to you. Keep your head up. I started a business after graduating and saw credit debt reach as high as $60K. As long as you can manage finances properly, it is a great learning experience. Today, I am debt free and run a nice little side business. I'm going back to optometry school after 4 years since graduating undergrad so I don't think it is a problem to be away from school (although I worked in a science-based industry so I sorta kept up).
If you defer for one year, what job will you be doing that will be able to pay down the debt? Once you account for living expenses, I don't think you'll be able to make much of a dent in your debt. I'm just playing devil's advocate.
Also, you have to think about your credit score. I would rather have $180K in school debt than have $140K in school debt+$36K in commercial debt. Think about how that may affect your ability to take out a business loan or a parcel mortgage when you decide to open a practice. Try to explain that to a loan officer. You don't have to tell the loan officer the whole truth about your previous debt (the $36K part). All you have to explain is the $180K in school loans part.
It is your decision. But if it were mine, I would just go. I don't know how you guys do it in Canada, but in America, debt is good. It is the basis of our capitalist system. It can reward you and it can burn you. If it is invested into education, I think it is always a good investment.