Your second pregnancy is the "just get on with it" one. Sorry.
Been there got the large tee shirt.
The thing about man I find I'd that they are often worrying about money and having the responsibility of now a big family- one baby is quite different from two children and a wife who is taking time out on mat leave, or possibly more to be a SAHP.
The juggling and multi tasking that is now necessary can be quite a shock to blokes who think of themselves as men, as opposed to fathers.
Some men don't 'get' the second baby until they meet him or her.
Ime most men are worry worts who think in financial terms about fatherhood. Your second pregnancy is a physical thing happening to your body and there is a huge worry that if it all goes tits up, he'll be left with two young kids to look after and hold down a job to provide from them too!
You need to down play the aches and pains to your DH as he's not on that wavelength, ask him to do very concrete things for you if you need help.
Ask him about his feelings and explore his worries with him. Make plans to ease the situation.
Complain to your girlfriends about your aches and pains, he's not on that wavelength- and that's actually a good thing.
You don't want him to be your carer after all: you're not ill, just pregnant.
Book yourself into have a massage, but don't expect your DH to be your midwife. Think about getting a doula if you need extra support and doubt he'll be any use to you at the birth.
I bet he'll be a super dad, so don't worry about it too much.