Oh my goodness, you poor thing! It's going to be ok. Just breathe slowly and deeply.
The best thing you can do is take care of yourself right now because I'm sure Little loves you very much and will be stressed to see you upset.
Re: high numbers - Kit has been as high as 527 and as low as 47 and we got through it. The numbers can be very scary, but you two can do this. You're strong. You've got this!
If Little's afraid of your hand near her head, Mika_Girl's advice of just treats and patting sounds like a good way to get her calmer. And I also sing when I do it the tests because Kit knows when I'm anxious and it freaks him out, which freaks me out, and then we're both freaked out. So singing helps us both. I also put the TV on in the background to distract us.
Or try the paw, like you were thinking before. I'm sure you've already checked out this video:
Maybe try some cream with lidocaine though before you prick. Might be less scary for you both since her pad will be numb.
In terms of being afraid of a crash -- I hear you. It's scary. I'm scared of it too.
Maybe set an alarm and check on her, or keep her in your bedroom so you can monitor her.
And some cats will let you know -- Kit wakes me up, howling, if he starts getting too low.
Maybe another more experienced member could comment on increasing the dose that much? I've been told to not increase it by more than 0.25 units (but we're on Lantus), so I would be interested to hear what others have to say. Can you post this in the ProZinc forum? I think they'll know more about it than I do.
Here's the link:
http://www.felinediabetes.com/FDMB/forums/prozinc-pzi.24/
Remember: you've been doing all the right things. You're monitoring, you're dosing, you're posting here, visiting the vet, and you're giving Little love and support.
You're a great cat mom and Little is very lucky to have you in her life <3
You got this, sister.