Kimberly,
Some of the things that you have mentioned in your post, sound like my DS to the T and my DS was a textbook baby.
I do agree, that at that age, they go through phases, of being grumpy, whiney, not wanting to go down to sleep etc. The crying out, could be down to seperation anxiety, and that will pass.
The not being able to sit in one place is definitely the age - He has learnt to crawl, and now he knows he can explore and he can now get to things that are out of reach etc.
The not wanting to feed when being out in public - as you can imaine, there is just so much that needs to be seen, and being out and about where there are other people can be very exciting as well as very distracting.
HTH
Paula x