Having Trouble In School. What Should I Do?

I'm having a lot of trouble in my nutrition cl at college. I'm really having difficulty comprehending the notes on the power point presentation and copying them down at the same time. I have learning disabilities and it is very hard for me to comprehend sentences and and verbal lectures at the same time and it's very frustrating. Like for example, in today's presentation we learned about the human body. Our teacher was giving a power point presentation and was explaining facts about what the body does. As she was giving her presentation, I was trying to take notes on each of the slides, but it was very difficult for me to keep up with the rest of the cl. Like when she was explaining the third or fourth slide, I was still trying to comprehend AND take the notes down from the very first slide. I was very frustrated because I couldn't keep up. And also, I'm very nervous about my midterm because she said it was going to be very hard. How on earth am I going to p this difficult midterm (it has questions like what makes up the nervous system, the main function of saliva is what? What specific hormones controls hunger? What is the digestive process? ) when I don't even have proper notes to study from? And another thing that worries me is that because of my learning disabilities, I happened to really suck at math and science. For some reason this cl feels like a science cl instead of a health cl. I am so ridiculously nervous that I'll fail, and I really don't want to fail. (my dad had suggested getting a note taker, but that is a whole big project, and my class is at night.) What should I do? I'm very nervous!