I'm a bit like this Fringe, although dd not breast fed so I had a bit more sleep. DD is now 15 months old and I am loving motherhood. At around 6 months old, dh and I went away fr the weekend, without dd to regroup before I restarted work. I was a stresshead right up until recently, when I decided things had to change.
DH and I now have at least one night per month without dd (she goes to grandparents) and we either go away for the weekend or stay home together. I got a cleaner!! there were a few other things, with me reating dh a lot better, but I can honestly say that these two things are the two that have made the biggest difference. I now feel refreshed, revived and like myself again.
It is early days for you yet, and of course you are breastfeeding, so for now nights away is not much of an option. Having said that, could you do a few hours seperate from your ds? He will drink from a cup I'm sure (dd had huge problems with her suck reflex and getting her to take a bottle was a real faff, taking over an hour, yet when faced with people who didn't take the whole hour to feed her, she might have missed one feed but never missed the next!) and if not, it will only be a few hours and at 6 months, with some solids to munch on, he should be fine whilst you sleep/have a bath/relax
Be kind to yourself, take time out and try and relax, it does get easier I promise, oh and going back to work helped me. It has its own (organisational) problems but otherwise it was fine, and I enjoy not having to feel responsible for someone else for a few hours, and love spending time with dd when i am with her (Most of the time )
I think what I'm trying to say is it does get easier, but I have to physically tell myself to enjoy my day cos I won't get the chance again - tomorrows another day, one day older and all that
HTH.