Ok I've been battling with this for the past 5 weeks.
DD has always woken up for night feeds 2 -3 times a night; I had no problems with this.
But in the last few weeks she has been waking up every hour, crying, not falling asleep on boob, waking up the instant I put her back down (even if she was in deep sleep).
I've eliminated these causes:

Solids (taken her off; no change)
Teething (I just really don't think this is it)
Eczema (It started around the same time, but I don't think this is it)
Hunger
Separation Anxiety (even happens while cosleeping/sleeping on my chest)
Hot/Cold
Nappy

Sometimes I've seen her start whimpering and lifting her bum up and down, like she needs to fart. So it could be gas.. Why does it only happen at nights? What is making her so gassy all of a sudden? My diet hasn't changed.

Or growth spurt or wonder week.. I don't know.
Anyone experience this with their little one at this age, for so long?