He smiled at me! And it was a really big one too. That's a huge improvement from yesterday when he smiled at the wall/ceiling while I was changing him... But I think it had something to do with interacting with him like you guys suggested (Thanks Mel!!), and reading him some books yesterday. He's looked a bit depressed (even mum said so...) for a week, and it might have been because I had no idea what to say to him. He seemed much happier today & nearly smiled at DH too (you could see him thinking...).
Next time I post in 'crisis mode' can one (or all) of you slap me & remind me that bad days are typically followed by good ones? I had the best snooze/sleep on the couch with him at the 5am feed. we stayed there dozing & feeding & dozing until 8am, when DH busted us.

I tried doing Tummy time with him today... he rolled over instead (it was assisted with the slope of the couch & pillow). I tried putting him on his tummy again & he squawked at me until I rolled him onto his side. Close enough.

We also went to the Chiro. It wasn't our regular guy (had a locum instead... all I can say is: he can manipulate my spine any time... hubba hubba!!), but I think it did both of us a world of good. My hips & legs don't ache anymore, and Jack has been asleep since 3pm (2.5hrs now). Which I think is great considering he's been typically cluster feeding at this time of day & then getting crabbier & crabbier because he's only getting an hours sleep or less. Fingers crossed! We're going to take him once a week for a few weeks. The Chiro said he was tight in one shoulder, and also in his lower back (from arching it all the time). He gave us some stretches to do with him, and showed us where to massage to relieve his colic pain.

Thanks again, everyone, for the kind words & suggestions. Xx

Tubbles - I do the same with Jack regarding awake time. He's not worth fighting with when he starts yawning. I know it'll be followed by a melt down if I don't put him to bed. So he gets a couple of sessions of awake time a day. If I want more, I can trick him with half a feed. That works quite well!