That didn't come across as a rant at all, let alone a long one.
It sounds as if you've got into a pattern where you're doing far too much, and he has not noticed how easy his life is. I notice you say you don't have hobbies or many friends - well, no wonder! You haven't given yourself time. And you must.
You absolutely could go into this all guns blazing and tell him he's being unfair. But, it sounds to be (and excuse me if I'm wrong) as if you don't feel up to that. If so, the solution is to be very direct and calm. Next Thursday, you are going out for a drink with one of these few friends; back by 10. Perhaps the Tuesday after you will want to go to a creative writing club that's just started up.
I wouldn't ask permission for any of these things - which, I think, is how you are treating it now? I'd just say 'Jane wants to meet Thursday, and I know you're in so I'll be out until 10' or 'I've been invited to this group on Tuesday; I'll be out from 6-8'. (I do know this depends how how breastfeeding is going, but I would think you could manage an hour?). If it were me, I'd be really sunny and excited, and then perhaps he'll realise how much you are looking forward to this.
If he does kick off, I would then get serious and point out that you are only looking forward to a well-deserved hour or two, when he has had whole days. You should not need to ask permission to have a tiny amount of time to yourself.