Need to make decision soon re: Nursing vs other profession . .

I have been officially accepted into the nursing program at my local community college next year. However, I am having second thoughts for many reasons and am hoping I can get some feedback from professionals currently in the field. I know nursing offers many options, benefits, good pay and ample opportunties which is the main reasons I chose this career and waited two years to get accepted into the program. I have been through a BS in business and cannot afford to waste any more time in school unless I'm 100% sure it's what I want to do for the rest of my life!
To make it short, my age and physical limitations are giving me serious second thoughts.
I am 43 (so I'll be 45 upon graduation), have DDD @ L4-S1 and cannot be on my feet for prolonged periods without sufficient back pain and definitely don't want to do all those night shifts/rotating shifts that I hear many, especially new grads, end up with. What other good career(s) in the medical field might be appropriate for someone like me that still offer good pay and good opportunities? I was thinking about X-ray tech, aka nuclear medicine might be better for me? My time is running out and I feel lost as to what, if anything, might be right for me.
Mom of 3 stuck in "occupational crisis"!!!!!