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Here's what I think is a good reason you should discreetly let a single person (your academic advisor?) know of your condition/diagnosis. If you don't & your behavior is as odd or off-putting as you seem to think, then you could be jeopardizing your position in yr program. At some point, they might ask you to leave.
But if you do let someone know, then your diagnosis gives you some protection should they choose to encourage you to leave the program. I don't mean to exacerbate any worries or anxieties you might have & I'm sorry if this advice does that. But I think my advice is worth considering even if you choose to ignore it.
BTW, you should also make clear to whoever you tell that you're sharing it in confidence.
And if you ever in the future feel your standing in your program is in danger & you have told your dept. about your condition, then you should consult an attorney specializing in disability rights. You'd prob. have a good case against them that would prob. force them to allow you to complete your program.
Notice I said "probably" since I'm not a lawyer & don't mean for you to consider this legal advice.