I have one of those people at the office as well.the best thing to be is straight out ask them to respect your space and not to touch you,they get the message..believe me.

Dont tell anyone you work for about your fibro they dont understand and start to treat you differentl I have even had a demotion since it went Viral!
Generally people do not know about empathy..
I am leaving my company and starting fresh at a new one.

Yes..It's annoying when ppl can't take the hint. They keep SQUEEZING you!!! :/ and when I did tell her she was hurting me and why because of my fibromialgia she just said that can't be hurting you I'm barely touching you girl..I almost lost it....sorry. no you shouldn't have to tell anyone that you have fibro just you don't like to be touched