If I'd been wrongly accused I'd be angry not anxious and there's no way I'd have left the disciplinary meeting without knowing what I had done to find myself there. I think there is more to this than you've shared publicly (and that's probably a good thing) but not having the details sure does make it hard to understand let alone help.
HR aren't wrong though - sounds like a therapist is a good idea, though obviously not an instant fix.
i do not think i was wrongly accused, given her change of behavior i really did hurt her, just i do not know what did it... i just know i broke something and seeing her knowing that hurts, and when pain arise fear follows, and we just had a fire escape exercise and of course i am in the same group as her...
(and i do see a therapist, well 2nd session in 2 weeks)
(and TP i eat a lot of vegetable, and fruits kinda is pretty much all i eat)
ps: thx all for trying to help, it actually does knowing that peoples do somewhat care enough to try
ps2: kinda a panicky mess right now so if i make little sense, it may be why, sorry.