Hey hun,
I know exactly how you feel, I've just enrolled onto an art and design course, and i'm terrified for all the same reasons as you! I did it last year but ended up dropping out halfway through due to this phobia! This time I won't let it beat me, and don't let it beat you!
For the anxiety I really recommend rescue remedy, you can get it from boots or online, it's sooo good, it really calms down your nerves so it's worth a try.
As for noro, I can't tell you whether you will get it or not, but my guess is it's highly unlikely with all the precautions you would take if there is an outbreak, just remember to keep cleaning your hands and belongings and not putting them in your mouth or on your face ect and you will be fine!
Please enjoy your course and don't let this phobia ruin it for you, it's your dream and you're more than entitled to it, it will be great!
Have fun!
I'm always here if you need a chat x