Here's what I posted in 2005, pre-swing, if it makes you feel less alone...
"The main problem is that he more or less WILL NOT sleep during the day, although he is clearly tired. He will doze off while feeding (exclusively breastfed) but only sleep for ten minutes or maybe half an hour tops (very occasionally he might sleep for nearly an hour in the very late afternoon/early evening) and that's assuming he's gently cuddled; any attempt to move him or put him down to sleep in his Moses basket and he's instantly awake. He won't go to sleep on his own in his Moses basket that just results in inconsolable crying. As a side issue, he starts to fuss and cry which I am pretty sure is down to overtiredness but can be soothed by feeding. So he ends up feeding most of the day off and on which I know is bad [edit: now I know it's actually not unusual. But I hadn't discovered MN at this point, remember] but I don't know what else to do when he's crying and I can't figure out any other way to calm him down. Carrying him in a sling (especially outside) used to work to send him off to sleep but generally doesn't now. He's realised that there is a whole new world outside and is now determined to look at that if he's taken out (again, I have managed to get him to drop off for about half an hour but no longer than that for some time). He actually sleeps pretty well at night (possibly becuase he's so worn out by the end of the day). Generally he'll have a bath around 7-8, then a bit of a kick around and be fed to sleep to go down around 9ish. Since he's not been sleeping in the day he'll then normally sleep 5-6 hours, wake up around 3am for a feed and change, then sleep around another two hours and wake up around 6. Sometimes (today is one of those lucky days) I can settle him back down after that feed for another couple of hours but after that it's go-go-go for the rest of the day. I know a 7 week old needs more sleep than that surely? I just don't know what to try to get him to sleep during the day. Just one nap so that he doesn't get so tired would be good. "