I just wanted to say this is incredibly common. It's hugely tough that first year. We're now finding that the second year is easier - we have more routines, can do more with the baby, life gets easier and we have more time to reconnect.
Your DS is old enough for some sleep training - if you want to try it. But don't do anything along these lines that you aren't ready for it or plain don't want to.
Things that helped for us were trying to fix a date night, or at least making sure we sat at the dining table and had a conversation, rather than slumped, exhausted, in front of the telly at the end of the day.
Taking the time when baby was napping during the day to 'reconnect' (
) rather than doing housework; 8mo-ish was when she started to have some decent daytime naps on her own. Ditto using that time to sit down with a book if you are on your own.
Try and get some daytime routines in place where your baby can play while you are doing housework. As he learns to sit, crawl and cruise things can get hugely easier. So sorting, hanging and tidying the washing can be a fun game because many babies love playing with clothes. Washing up can be done while he feeds himself in his high chair next to you - again, if he isn't already feeding himself a lot, he soon should be able to. This way you've got most of the main tasks done during the day and it leaves more time in the evening.
And be open and honest with your DH. Tell him how you are feeling, that you know things seem hard but you do love him and you miss the time you used to spend together. I used to force myself to at least watch the news or flick through a paper so I had something else to talk to DP about than the baby - when you are at home all day, or going to baby groups, it's sometimes hard to find something else to talk about, and then that means your time without the baby can just become 'talk about the baby' time. Yes, babies are wonderful and amazing, but ten minutes of conversation about something else is nice too.
It really does get easier as they get older. at 14mo DD can now amuse herself and will happily potter around me while I do the housework, I just chat and interact with her at the same time so it still feels like quality time between the two of us.