My 16 month old dd2 has been like this from day one oldmamas. DD1 was a fab baby too and a fantastic (mummy may be biased!) 4 year old now.
DD2 cried all the time when tiny, tried everything to make her happy. Cranial osteopathy, soya milk, gaviscon, gripewater, colief- the list goes on and nothing changed.
She is now walking and is pretty much as bad as ever. Her constant crying and grizzling drives me slowly bonkers but I do try and ignore it.
She cries at pretty much nothing and wont even go in a pushchair without crying to get out. Only just got her used to the car for very short journeys.
I have posted on here a few times too but have come to the conclusion that some babies are just bad tempered and frustrated. Not much I can do but try and stay sane but it is hard when it affects us all so horribly.
We are all suffering, expecially dd1 which is so unfair but I know it will end, apparently.
Not much use to you but wanted to let you know you arent alone. I have been known to shout a fair bit too, even at dd1 who is never really any trouble but the whining from dd2 just gets too much.