Amy, glad you've finally got a name for your problems
Trying to explain to a non~FMer what it is and how it affects you can be difficult as they don't tend to have anything like it in their experiences that it can be compared to.
There are a few things on here that might help with getting people to understand a little of what you're going thru. Here are linkys to a couple of themviewtopic.php?f=2&t=4732&start=240viewtopic.php?f=2&t=1761
Have a read thru them and see how they may help you.
Now you have a definite dx, you really need to let your employer know. FM is covered under the Equalities Act 2010, so once you have told your employer, they should then work with you to make reasonable adjustments to your job so it is as FM~suitable for you as it can be. Again when explaining, giving them some info may help. As well as the linkys above explaining about the more personal side of FM, this linky to NHS Choices about FM explains the clinical side of it, which may be helpful for your employer http://www.nhs.uk/Conditions/Fibromyalg ... ction.aspx
Anything else you want to know about, just ask and we'll see how we can help you with it