Hell yeah, I hear you. I have had periods of feeling exactly the same - I had no idea how much being pregnant would take away 'me'. I've heard my boyfriend telling a mate he doesn't think we should have more than one kid because I'm just so different that he doesn't feel he can do it again. To which I half felt sorry for him, half felt like kicking him in the nuts - HE doesn't feel he can do it again? All he's had to do is have less sex but more blowjobs instead, how dreadful for him (please note sarcasm). What we found particularly hard, was the things that we'd do with each other to 'test the water' for sex, things like nipple stuff or snogging, I just couldn't do - nipples and boobs too sore, and he smelt AWFUL to me so I didn't want to kiss him that much. Weird.
At the moment I'm 32 weeks, and I'm back to not being interested in sex - the first trimester was bad, but I tried hard to be in the mood a couple of times a week (it actually made me feel a bit better afterwards - like I was 'me' again for maybe 10 minutes), second trimester was fine really, sort of back to normal even if less energetic, third trimester I ache all over... the last thing I want to do is be poked with a penis. I talked with him about it and just said sorry, take my word for it, it's just as frustrating for me. His attitude has changed as things have gone on, from being a bit peed off about it, to just accepting it and doing more wanking!
Be prepared to feel a bit 'not like you' for a long time though - it's been the overwhelming feeling of my pregnancy. I spent the first four months basically grieving for my old self and life - lots of anger. These days I have the odd day a week when I still feel like that - now it's less anger, more random crying - but most of the time I've just come round to it and am actually looking forward to meeting this kid, and especially to having the chance of feeling back to 'normal'. Well, 'normal + kid and less sleep'. We're actually looking forward to parenthood.
A book I read which I thought was good for blokes was called Fatherhood by Marcus Berkmann, tells it like it is. Another one, intended for women, but short and snappy to read was a Kindle book called something like 'The Smart Girl's Guide to Pregnancy' - lots of truth written in an amusing way. Try him on those!