Hi Susan,
If you want to let me have your e-mail address, I could send you a couple of documents that may be of some use. I look after health and safety in my office and all staff are required to undertake workstation safety modules and tests, currently on a yearly basis. These are used to minimise RSI's and discomfort by making sure you and your computer, keyboard, etc. are positioned correctly.
You should be able to report any issues you are having to your line manager or health and safety coordinator if you have one. You will need to make someone aware just in case you ever have to go on sick leave because of it. There could be monetary implications if you end up on long-term sick and haven't brought your workplace issues to light. You just never know.
Check to see if your company has policies on this kind of thing as well.
Good luck
