I've been there - and it does pass (or you get used to it, I'm not sure which).
Although the newborn weeks were intense, and I was knackered, I didn't really struggle with them. My husband and mum were around a lot, and I wasn't expected to do anything but keep these two brand new scraps of life alive. As they've got older, I think they need more effort and attention, not less, and i'm not expected to need the heavy-duty support I had in the early days so I am on my own a lot more.
Personally, I found 8-9 months the absolute hardest (so far!). My twins are 11 months now, and although still exhausting, I can carry on because I go back to work in a month! That sounds really harsh, although I love these two wrigglers so so much, I will be able to care for them much more effectively if I have a few days away from th each week, knowing that grandma/nursery is also a good experience for them.
As with everything, this phase will pass. Your baby will change, you will change, the weather will change. You'll make a new friend, find a new group, get more/different help. Just keep going, try to remain sane and care for your baby, and remember that nothing ever stays the same for very long 
Good luck!