Oh No! Its so exciting that you’re going back to school, you’re so brave! I took a class a while ago and it was the first time in over 30 years that I’d been in school. I was a wreck, complete wreck. It was even night school in a “women in Transition” program, so I was around others just like me. Luckily I had a friend taking the same class but I was so nervous I thought I would pass out. Sounds crazy to some people, but that was me.
Please dont give up! YOu made it to the class, you had a little melt down….so what. Get back in there and think ahead… or don’t think at all… just get to the class. Like woody allen says, 99% of the job is showing up. If you think you’re taking on too much of a load, cut down on your classes until you get acclimated, then you can add more next semester. Hey, its been fifteen years, whats an extra semester. Don’t be too hard on yourself, this is a big step. You’re an inspiration and now I”M counting on you 
You can do it! 