Fibromyalgia alongside MS

Hi everyone, does anyone have MS and Fibromyalgia diagnosis? If yes, what are your main reasons for having the fibro? It’s been mentioned by my physio that I have fibro (as well as the MS that she treats me for). I didn’t question it that the time, as I was shocked……now I wish I’d have asked her more, like why she thought i had fibro and what symptoms she thought meant it was fibro and not the ms? Any help on this from anyone’s experiences would be appreciated if like to know why she thinks I have fibro mainly. so I can speak to my doctor. I have 6 week blocks of physio and it was my last session before I have to get re-refereed via gp for another 6 week block…… Thank you