I think the shaking is pretty normal for these little guys. Mine shakes if she gets too much stimulation, like riding in the car and the window is open,
OMG!!
Too many smells or whatever. If this little one is quite young you will need to stick with the nutrical to be sure he blood surgar is ok. Mine I had to force the nutrical onto the roof of her mouth, but it seemed to stimulate her appetite and then she would eat some.
Hope this helps.