Check out...
The Spoon Theory written by Christine Miserandino, you can read it online, very good at explaining. If he still does not understand reconsider marrying him.

He can read online the: 200 symptoms of fibromyalgia, to get a better understanding of what you are going through. Good luck.

aww he needs a wake -up call its not some fake illness.... tell him its listed as a disease and it is also payable by a disability claim, never feel bad for having it... its hard enough to try and survive it!! also you can tell him next time he has the worst flu he gets with body aches, is how you feel, maybe he will try and understand better. blessings to you hope you can get the support you need.

Have him read some of the stories on here. That's one way my ol man learned

I was married to a man like that, he even went so far as to say "I didn't marry you to support your a**!"
You need someone who CAN understand and will understand. My husband (new husband now) is so supportive and understanding that some days I wouldn't make it without him.
You WILL need support in one way or another, some days it might be with cooking or with cleaning or with the kids. If he can't understand your bad days and he KNOWS you, be careful with your future.
Savella helps me a lot with my fibromyalgia, though my RA stills kicks my butt (so far I've been allergic to all RA meds) and mild muscle relaxers. Try to find a medine or routine that helps you. Be careful with Lyrica, it was 3x as hard for me to get off of it than any med I ever had, plus I gained 70lbs while on it. Took 4 mos. to finally stop taking it (caused tremendous pain stopping it) I dropped 30lbs in 2 months once off it.