Many couples don't make it through an illness like this. The partner of the afflicted person has to rearrange their life as much as the person who suffers. Now there are two people who have to miss events, cook meals, keep the house running, etc. It is not just you. Your partner has to give up a lot. Most don't anticipate what it means when you say "in sickness and in health" until it happens. It takes a lot of love, respect and understanding to reinvent yourselves as a couple with some mutual limitations. How strong is your husbands' bond to you? This is what makes the difference. Would he rather continue his life as it was before your diagnosis and give up on the situation. Most partners give up. Those that don't, develop a bond that is unbreakable. Good luck. Go to support groups and do what you can anytime you can.
Without knowing you & your husband, I'll bet you use "fibromyalgia" as an excuse to not do a lot of things he wants to do. My advice: YOU need to get past all the "I don't feel good" excuses & quit expecting HIM to understand it. I see a short road to divorce. With a 65 mph speed limit.
I know where you are coming from. My wife has the same condition, she works more than a full time job but sleeps most of her off time. Marriage is a deal you enter into without knowing the options. If you love your partner you accept what can happen. She will not talk about her condition or joint support groups, or anything other than try and ignore it! So, I cook almost all of the meals, clean, dust, and maintain our home inside and out! It could be that your husband like my wife isn't ready to admit that there is a problem! For what it is worth it has been 10 years since her diagnosis.