Hi Katherine,
Well, I haven't got Fibromyalgia - but my disorders are very complex, and progressively become worse over the years.
We've just celebrated our Silver Wedding Anniversary 25 years!! Yeh, we reached that one!!
We been together since 1989, I was diagnosed way before then. We went on and had 3 children, 2 boys and a daughter! Yes, I had energy back then.
We have many, how shall I put it disagreements over the years. We've never got to the point of splitting up, and we always make up anyway.
As you get older, I found things like standing impossible for just a few seconds, but I suppose it depends on you and your partner and understanding them, and what they can and cannot do. It is not like we want anymore kids at our age, well my age, 52 - my wife is 6 years younger than me.
Everyone we meet in hospitals for appointments say they never known such a couple that can have a laugh at their patners expense. To be honest, life is to short as they say, I might be disabled in many ways, but we still have a laugh.
Socializing is another matter, neither of us really do that now - even though, we are giving it another go, but this was because of my doctor's orders! lol
My brother and his wife and child is another case, they are going through a really messy divorce and both of them are supposed to be reborn again Christians, yet if you met them you wouldn't even think he is my brother!! Everyone is surprised, I don't have much to do with either of them, they are both as bad as one another, and tried to bring me into the divorce, which even includes blackmailing, embezzlement, abuse, etc the list just goes on and on. They been married 14 years just, and even that was a mess - personally, I don't think they were capatible in the first place.
My wife cares for me 24/7 - she keeps me in order and well looked after, I couldn't wish for anyone better. 
Regards,
Les.