Businesses fail all the time, it's an extremely hard thing to make work. Often small business owners live to work until the business is sustainable. It can be hugely rewarding or completely bankrupt you.

As for school loans, it sounds like you would qualify for aid. And any loan that lands you a career making hundreds of thousands as a doctor is miniscule compared to your earnings. You just gotta make it though and not give up. It takes a very special individual to finish med school and residency. There's a reason most people cannot do it.

Whatever your path forward, work as hard as you can to make it happen, no one else will do it for you. Best of luck!