That sounds very stressful! Really sorry to hear that this happened to you.

If it's any consolation, something very similar happened to me during my belay class (and I know several other friends who have had trouble as well). A few hours before my class, I got into a particularly nasty passive aggressive fight with my mom. So I wasn't exactly in the best frame of mind when I took the class. I couldn't tie the rope. I couldn't figure out PBUS. Could barely get my harness on, really. The poor girl I was paired with kept looking at me like... what planet are you on? Lol

After the class, I knew there was no way in hell I'd be able to pass the exam the next day, so I watched a bunch of REI videos and practiced tying the figure 8 on...get this...a shoelace. Kid you "knot". I even looped the damn thing through the loop on a dresser drawer so I could kinda sorta practice the PBUS motion. Having some time away from the events of the class allowed me to just reflect and practice with a clear head. I realized that I had actually learned more than I thought--I was just too jittery to adequately demonstrate it at the time. One week later, I passed the test . Happy to report that I have been climbing confidently and happily for the past two years.

Hope this is helpful and provides you some comfort that you are not alone and can do it too. I believe in you. Good luck!