Cabbage, I think I'd choose no. I also love the excitement and attention like you. There's nothing like it.
DP was a bit of a twat when I was pregnant with DC3. Ok, so he was 21, but I was young too and he caused me so much upset (playing on Xbox instead of discussing baby names and prams, going out with his friends and coming back stupidly late and stupidly drunk, getting into debt, the list goes on). In the end I was anxious, needy, insecure and never went out, unless it was to do a food shop. (He didn't stop me going out. I just lost all confidence.)
2 years on, things are very different. He got a good job and passed his driving test. The Xbox mostly collects dust and he doesn't go out that often (still can't handle his drink though!). I, instead of being desperately ill with morning sickness or attached to a clingy, breastfeeding baby, now have a life. I have made friends and see them regularly, whether it's for a day shopping or out on the piss . I've started an exercise class. I go to every baby group going, and drive to new places.
I'm absolutely terrified that getting pregnant again will take me back to where I was before.
Sorry for going on a bit there! I think you should spend a long time working on yourself first, then see if you still want another baby. I think that maybe you need that fulfilment as you don't have much else going on (I don't mean that in a horrible way, sorry if it comes across like that).
I'm also put off majorly by the car thing. We currently all squeeze in a normal car but I wouldn't want to drive or pay out for a bus, particularly!