Remember:
Even if you separate or divorce, you still will not have a "family" nor will your daughter... except that it will be even more, stark. Mostly for your daughter. She will lose her Dad.
Then, "custody." How can your Husband, if he has ALL those health issues and handicaps and sleep issues and sleepy issues and barely can even function most of the day and if he is SO introverted-- HOW will he, be a Single Dad... on his custody days, with his daughter???? He will not able to do the normal "able bodied" things with her, that a parent without health problems, can.
I know of a couple of couples... that actually divorced. BUT they still live in the same home all together with their kids. So that, their kids can still have their parents around and so that the kids do not have to CONSTANTLY shuffle back and forth toting suitcases everywhere each and every weekend, that they have to go and be at the other parent's house... if there were living in 2 different locales.
But these couples, get along basically but have no love for each other and divorced. They are good at being "friends" though. And the arrangement they have, works out for them. And yes, they have their own lives etc. Separately. And the kids, get it.
It unfortunate that you both got married even though you did not love.... the man who became your Husband.
I imagine, that he was always this way and you knew? Unless he was a totally different person while you were dating and then he suddenly turned introverted and OCD and arthritic and you didn't know beforehand of his health issues.
But then... you both had a child together. And you say he is a nice/good man.
BUT he is in his own world I guess... being he has so many health issues and is so introverted that it is a major handicap?
The thing is, EVEN for married people who do love each other... but the Husband does NOTHING to help in the home and is hardly home AND does not even parent the children... a woman in a marriage like that is like a "single" parent, too. Even if the man is perfectly healthy and extroverted. And some Husbands, are just NEVER home at all... even if they can be. They just rather go out with the boys and hang out at bars or play golf everyday. And they do NOTHING, for their wives or children even if they are able bodied and in perfect health.
So, which is worse?
You sound very disappointed... in him. But also in yourself.
It is not only his "fault."
No one asks to have arthritis, etc. and it is very painful and handicapping. I have relatives with Arthritis.
Perhaps, he can see another Medical Doctor or get 2nd opinions on his medical conditions, and see a Therapist for his OCD and work on his social skills.
Can't that be a way to problem solve this as well?
But sure, you and he do not have normal interaction that any couple does.
But it seems he tries. But perhaps, he needs to try other things if the type of help he is getting is causing a stagnation... in his progress or prognosis.
Is your Husband happy?
I mean, you are not happy with him & you don't love him, but is he happy with you?
Have you both tried marriage therapy?