Oh, just thought of a couple more things to add.
You might address the need for sameness, order, routine. You could explain it something like - what if everything you were looking for was not where you left it? You might be a little confused at first, then you might get upset because you couldn't find anything, or it just took too long to find things. You would be upset that the order in your life was all turned upside down.
You might also address the physical uncoordination that sometimes goes along with Aspergers. Something like - what if your arms & legs & feet didn't work like they used to. You might not be able to ride your bike, (or whatever - add your own stuff here). You'd be frustrated that you couldn't do activities like you used to do... activities that it seems everyone else can do.
Or - What if you had trouble getting to sleep - every night - and had trouble staying asleep all night. You'd be really tired every day, and even less able to deal with [all that stuff you mentioned before].
ETA: And my personal favorites: what if it felt like your shoes were on the wrong feet, even when you put them on the right feet. What if your clothes felt itchy all day. You'd probably be distracted by those problems all day, and not be able concentrate on much else. You'd probably also not want to wear those shoes and clothes again either.