I'm not a woman or suffer the same disease as you (I'm a 38 year old guy with MS), but I'll be brave enough to step forward.
I would quiz my gyno on all this. I know many meds, especially for pain or depression, can kill the sex drive. Which makes no sense at all from my stand point. Everyone's individual physiology is just enough off tilt so that no two reactions are identical.
Most of the western world is sexually repressed. We see hints of sex on the TV and billboards but it's not something we talk about over breakfast.
*Since MS and a car wreck 3 years ago, pretty much any ailment you can think of regarding a penis has hit me. I've pretty much given up that that part of my life is over.
But this isn't about me and I would hot foot it over to a doc for help on this.
Plus a Moose size thread bump never hurts.
I am the MonSter that MS fears.