Re: will lower back problems restrict my ability to be a nurse?
I don't think it's a good idea. Good body mechnics aside, the number one injury for nurses is back injuries, at a high cost to both society and the nurse. You would be risking causing further problems to your already existing back pain.
As you've already heard there are areas where you don't need a good back, and there are plenty of nurses working with bad backs and taking pain medications. So it can be done.
I oriented a nurse, who secretly admited a bad back to me. "I need surgery and am waiting for my insurance to kick in." Two days into the job she her back hurt so bad she quit.
Also, you're going to have to be truthful and mention to the school and employers of your condition. You might run into trouble, or have to prove your capabilities or provide MD clearance.