My High school diploma wasn't given to me when I earned it

What should I do ? I want to go back to school I want to go to nursing school but I don't know how that can be possible for me to do I went to an independent school my last year and half of school and yes I did graduate from that school but there was a big problem when I did let me explain to u the principle of that school was very strict not in a good way yes I had all the credits to graduate high school but I was missing a few things she let me make those things up on my own time I worked my ass off and she said if I had everything done ( on this list she gave me it was a few missing math assignments)by the last day of school she would let me graduate on stage and she gave me a this other girl a week to finish it I did everything even a lil extra and she said the work was good and she said yes I can graduate on stage comes the day of she told me no I couldn't I was so sad I felt I disappointed my parents so much me being there oldest child well the principal said I can come in the next day to pick of my diploma in the office with my high school complete papers well when I did the diploma wasn't there only the high school complete papers were the people in the office said they didn't know anything now I don't know what to do that was in 2014 .. Then a few months ago my old teacher from the independent school called me and told me that old principle no longer works for that school and she knew my problem she said there was a few others that we would be called or informed when our deplomas come in that was in December she told me this its now July and I want to go to school I now have a baby and I want to go to nursing school so I can get a job but I can't without prof of my high school diploma 😪😪😪 what should I do should I just go to adult school? Then nursing school I'm so confused and I just wish this never happened to me I want to get a start on my schooling I feel like I'm wasting my time all this time I could have been in school but it's not my fault any suggestions please !!!!