First, take a deep breath. then, look at yourself in the mirror and say, "I am a good person. I can figure this out. There is no problem that can't be solved. I can do this. Lots and lots of other people have been at this crossroad before me and they have been able to reach good solutions. I can do it, too."
Then, sit down and write down all of your choices. Retake semester, reapply to same school, try to go to different school, search other careers, whatever your choices are.
Then, under each heading, write down the pros and cons of each choice.
If you believe in prayer, ask the one you pray to to help you have clear thinking and to help you see what His choice for your career is (if you believe that He has a choice. I'm not trying to force religion on you, just telling you how I go about making big decisions.)
I also ask God to open an avenue for me, close off any wrong avenues, and give me sensitivity to hear/feel/sense His leading.
Often, He leads through other people. I ask my wife, my pastor, maybe a close friend or relative to be in prayer for me to get the answer I need. Then I fast and pray, study Scripture, wait on God for Him to reply. That probably sounds weird to those who don't do this. Sorry, I'm not trying to confuse anybody. It's just how I do, how I've been taught to seek guidance.
You might also want to see help from a guidance counselor or two and maybe take an aptitude (interests) test or two.
I believe the answer will come to you.
I wish you the very best and pray for you to have clear direction and very good success.
How did you pick Nursing originally? What is it about Nursing that interests you? What area are you thinking you'd like to work in? What exposure did you have to Nursing prior to going to Nursing school
Where do you think the problems were that caused you to be at your present circumstances?
Please keep us updated on your decisions. God bless you!