It kind of sounds like his teeth are bothering him to me.
We're going through the same thing.
DS was sleeping through (10 hours) every night then out of nowhere about 3 weeks ago started waking all night.
I had just started him on solids and so I blamed that initially - stopped all solids and there was no improvement.
I was just about to go round the bend one day last week when he had me up every hour, all night. Lo and behold a couple of days later his first tooth is just breaking through now.
He's also normally a happy little bubba and just hasn't been himself at all - cranky, clingy, waking up alot and for about 2 weeks his day sleeps were pretty much written off most days.
Now the tooth is coming out he's been a bit better but still waking alot.
It's all been a rude shock to me because DD had no trouble whatsoever when she was teething - just woke up in the morning (after a full nights sleep I might add LOL) and there they were. Don't think it'll be so easy with this little man.
I think you're doing all the right things to make him feel better, unfortunately that's all you can do and we just have to ride it out