Ok just my two cents, with everything you have posted even after this post, this one I came back to comment on, but adding it all up (from what you've said) all we can do is jump to conclusions because of what you haven't said.
So my conclusion to this statement mixed with the others would be: if the school called the police on you for having an anxiety attack, you must have gotten violent or were so out of control and so big that you may have accidentally hurt someone when they were trying to help you. As of course usually students don't know what is actually happening and rumors start to spread. I'm thinking for it to be an actual fear they have, that it's had to have happened more than once. You have doubt within yourself therefore you automatically assume it's everybody. And also with those posts, I'm assuming that it is the way you carry yourself physically, if you say is because you are a big guy, then you either don't smile or you sneer. You probably stand with your arms crossed legs spread like you are tough. And people like that are hard to approach and be approached by. Because I have known many big guys and the way they carry themselves makes a big deal. Some you can tell are just big 🐻 while others just shine the aura of being fun, then there's the insecure ones, then there are the ones that look like bullies. Funny thing is not all of those descriptions are how those individuals are, its the way they carry themselves. Posture, and facial expressions. I have never even met you but these are assumptions that are made because you left out details. Important ones for us to be able to help you without jumping to all these conclusions. That's all anyone was trying to say. If we didn't care we would just ignore the post and not respond at all.