she hasn't been able to tell me that she misses me as she says she doesn't know if she does and when ever I message saying that I love her she just reads it and doesn't reply
It's because you're getting on her nerves. If it makes you feel any better, it won't just be you - your children will also be getting on her nerves. As will any pets you have, her parents, your parents, and so on.
Your wife sounds like she is also struggling with 'can't-be-arsedness', in which every single thing - even picking up a pair of shoes to put in the cupboard - will seem monumental and impossible. I can't even begin to describe how awful this is: it's been the single worst thing about my own perimenopause, and I've got a list of symptoms as long as my arm.
It's shit for you, and you sound like a really nice man, but as gently as possible, this isn't about you right now. I didn't even feel sorry for my husband, and he's hands down the best bloke on earth.
Here's my advice. You need to pick up the mental load. All of it. I realise that's near-on impossible because you're away for 8 months. But you need to know all the family's appointments, clubs, activities, clothing requirements, homework - everything - and you need to do as much as feasibly possible from a distance. I don't know how you can do that, but you need to think of a way, because your wife can't do it due to 'can't-be-arsedness' and she needs someone else to do it. And you need to do it without asking your wife 'what needs doing?' because that is her just managing yet another person and she may as well do it herself. She has to know what needs doing without asking you, so you need to know too.
As other PPs said - arrange the cleaner. Don't just suggest it and then leave it to your wife to sort out. Research cleaners yourself and get one employed. Also some kind of home help - maybe someone to help with cooking, tidying up, etc.
Also as PPs said - send her nice things occasionally - books etc. If you must send flowers, send the ones that are already in water and in a vase. It's hugely irritating receiving flowers and having to cut the ends off the stems, find a vase, put the flower food in, arrange the flowers. It's just yet another task to do. But really, while these things are nice and all, they're easy to do. What you really need to be doing is taking jobs/the mental load off her and doing them yourself or outsourcing them.
The last thing I'll say is that you sound like you're being quite needy. I get it - your wife has changed, and it's rocked your entire world and you just want her back. Believe me, she wants herself back too. But all this asking her if she misses you - you need to back off because it's just yet another pressure on her that she has to deal with. Message her, tell her you love her, tell her you miss her; but stop expecting and asking to hear it back. HRT is pretty good, but it's not a miracle cure, and she's likely not going back to the person she used to be any time soon.