I will say on the picky eating habit, that can be a common behavior seen in autistic folks. With me my picky eating stems from texture - if a food feels weird in my mouth I get nasty gag reflex or vomit. Doesn't matter how often I try, there's foods and ingredients that, if I chew on it, I will vomit. It fucking sucks. I have to swallow my edibles whole with water cause most gummies make me vomit if I chew them.
Obviously not all picky eating habits are autism related, but myself and the other autistic picky eaters I know are just as frustrated, if not more, about having those habits.
Being stuck on music though, that I can understand. Even with me having my comfort zones, it's always an occasion worth celebrating when I find an artist or album that absolutely SLAPS me silly from how rad it is.