OK, let's see:
Bullied: yes, a bit. More just surrounded by baffled kids who would stare at him saying, 'Why does he always cry? Why does he run away? Why is he under the piano? Why does he scream at school....?'
Unhappy: particularly in retrospect, yes, very. At first he was only unhappy (miserable/desperate) at school, quickly forgetting it in the holidays. Then I suppose he gained more sense of time, and SCHOOL loomed over the whole holidays as well. And (also in retrospect) we really didn't help by assuming he needed to get used to it, and would if we were firm about it.
Things he hated about school (not an exhaustive list): crowds, the (red) uniform, assembly, the smell of lunch, the smell (sorry, scent) of some of the staff, the moise, baffling playtime games, the lighting, being asked to speak in front of others, being told to STOP talking, doing things on other people's terms, the feel of the chairs....
Friends: he did better with newcomers to the school, presumably because they weren't part of the mob, or because they hadn't yet seen him under the table screaming. He had one sort-of friend in Reception, one genuine self-chosen friend the following year. It used to take hours of visits both ways before he could relax and really play -- usually they were just about starting a game when I was trying to leave for home. It's taken years for him to visit them without me.
Diagnosis: I told him after various extra assessments when he was about 9 and was starting to question it himself. He was quite pleased and intrigued to learn that though he was unusual, there were enough other children with similar operating systems (techy computer kid here!) for it to have its own name. He knows that he's 'quite like Uncle T but more so' (insert suitable much admired relative here).
Could probably do a PhD in Obscure Things about DS1 by now, but I need to check where they all are. I hope some of this helps.
Oh yes, your final point about moving: in our family, if DS1 is keen on something, it's altogether more likely to be possible than not. He also might stand out LESS in a class where he's not expected to know the language and norms. Some adults with Asperger's would say that school was a foreign country to them anyway.