Komodor- your situation sounds nearly identical to mine. My husband is in the middle of his internship and I am an attorney.
We married between his first and second years of medical school and between my second and third years of law school. I moved to where he was attending school and completed my 3rd of law school in that state.
I know very well the feel of looming student debt. However, I can't complain about our situation right now. We are happily married and we just bought our first home. I am paying back by law school debt at the 10 year rate. My husband chose to consolidate (excellent interest right now) and to defer payment on his loans as long as he is eligible. Our expectation is that once he completes residency we will begin to pay down his debt at a rapid rate. By that time, we will have paid more that half of my debt.
So, it can be done. We are very busy, and by no means have a lot of money. But, I cannot say that we are struggling.
Based on my personal experience, I think it is helpful to you that your fiance/wife will be in school/working. You will be very busy and she will have her own life, instead of depending on you for one.
So, I know the financial burden may seem overwhelming, but I think it is definitely do-able. Good luck.