that's great news magoosmom - its amazing how much better you feel after some sleep isn't it?
some success here also with 21 week old ds2. after two of the worst nights ever (sun/mon night) where I got less than 2 hours sleep and he got about 5 hours, we ended up doing a cross between cc and pu/pd.
dh had already started settling him for all naps and the first part of the night, but he was really bad once i went to bed + I couldn't settle him at all without letting him sleep on me. So on Tuesday night I just couldn't take it and me + dh both slept downstairs.
i fed him + put him down about 5.30pm because he was so overtired. If he was only protest crying then he was left for 5 mins, then dh went in + rocked him till sleepy again then put him down still awake - any distressed sounding crying + dh went straight back in (but to be honest, there wasn't really any!). After about 4 goes, he fell asleep on his own about 6.15. He then slept until 3.30am!! So it turns out I was disturbing him when i went to bed and just by being in the room!
He didn't really settle after that though and he whinged on + off till 6.30am. He had lots of naps yesterday and seemed to be catching up on sleep so we decided to sleep downstairs again last night.
I did last feed of the day + put him down, expecting that dh would need to resettle - but by the time I got downstairs + put the tv on (we have a camera on him!) he was asleep! Not a single sound 
He slept till 1.30 am + I think i was too hasty in going to feed him, should have let dh try to settle first - seeing me woke him up too much + he whinged on + off till 4 am when I fed him again and he went back to sleep till 6.30am. I have just put him down for a nap for the first time in a week + he went down with no feeding or crying.
So me + dh have decided to sleep downstairs for the foreseeable now - we only have a 2 bed house and the two dc can't share so this is the best option until we can save to do an extension for a third room.
I really felt the cross between cc and pu/pd was a gentle way, ds2 clearly wouldn't settle with me there so having dh do the settling was best, and he was never left to cry for too long and never if he sounded really unhappy about it. I'm sure we will still have bad nights, but I feel much better that we have a plan + that I've finally had some kip!
Good luck to anyone else battling with sleep issues, its really no fun at all and sadly most people don't understand if they haven't experienced it - my mum had no idea that some babies don't 'sleep like babies' and my sister thinks its as easy as waiting for a tired sign and just putting them down!