From your posts it comes across that there are 3 basic reasons you don't want to have sex:
- health issues
- general exhaustion due to pressures of life
- your husband is sexually selfish and it isn't satisfying for you
Your DH is not unreasonable in being attracted to his wife and wanting to be intimate with her. In my experience it is quite unusual for a woman to completely go off sex. Certain life stages can impact on the frequency and enjoyment - for me, perimenopause was the biggest change - but usually they are temporary, and in a loving relationship you want to get it back on track for your own sake as well as your OH's.
To take the second point above, do you feel that you share the workload, you and your DH? Because if not, not only will that add to your tiredness but to general resentment, which is a passion-killer.
To take the third point, have you told your DH that sex with him isn't enjoyable? That you would enjoy it more if he thought about your needs? Have you told him what you want / what feels good for you? Or does he know that you don't really enjoy it, so he thinks he needs to get it over with quickly and he doesn't realise you would like it to last longer and focus more on you?
If your relationship is otherwise good, then it would seem to make sense to talk, to work on the reasons, and to see if you can get back to a more 'normal' sex life (ie you both enjoy it. it adds to your intimacy and closeness and general wellbeing).
If you don't want to work on it (and there may be really good reasons for that, eg he's a rubbish husband generally) then perhaps youre relationship has run its course.
You should never have sex you don't want. But also, it's reasonable for people to be attracted to, and want to be intimate with, their OH. If you think you just don't want to have sex again, then it's better to be honest about that, not force yourself to have it, and to split up, so that you can both find happiness apart.