I've namechanged for this as it would potentially "out" me.
I work in a public sector non-management role. Working alongside me is another woman, we do different roles for the same person and are paid at the same pay grade.
Since I started this role she has said some obviously nasty things ("things will be different when the new boss starts, I'll make sure you won't be going out of the office anywhere") and some odd things that I'm sure were meant nastily too (think 'jokey' things like "you type too loud" and "don't yawn, you've only just got here" when she'd just come in to work and I'd already been in for 6 hours). Once she read an email I'd sent to our boss, which was marked confidential, and discussed it with another colleague, in what she clearly thought was a whisper, directly in front of me, for 45 minutes. She then waited for other colleagues to return and, making sure they could all hear, told me I shouldn't have sent it to our boss but to my then line manager instead. My boss had asked me to send the email to him directly following a private conversation we'd had about my working arrangements.
She's also tried to cause friction between me and other colleagues by suggesting that they should "have a word with me" about really trivial and odd things like my tattoo which was slightly visible as I was wearing tights (it's on my leg, not offensive in any way) and my dress length (which was mid-thigh and not at all indecent). She's tried to turn work friends against me by telling them what a dreadful person I am but hasn't been able to give any examples because there simply aren't any.
Recently she's taken to either not speaking to me at all when we're both at work or only doing so to have a go at me for something I've supposedly done wrong. This makes things extremely difficult when we're supposed to be working together. I've raised concerns about her behaviour towards me and others several times before to immediate line managers, second line managers, HR and trade union reps, and they haven't been acted upon once. I now know others have raised concerns that haven't been acted upon either, and that I am not the first colleague she has treated this way. Now our line manager is one of her best friends so I feel totally helpless.
At the moment there's no other roles I can move to and I haven't been able to find any other job options that fit my skills & experience. I suffer from anxiety and this situation, along with some job insecurity, is causing this to flare. I am currently having counselling as a result. I want to get out of that department as quickly as possible and fear being off sick may make that impossible so I feel totally stuck.
What would you do? How can I deal with this? Am I being pathetic? 