He was afraid of this. He knew his brother didn't like needles. Of course, Gilbert pretended they didn't bother him in all his awesomeness, but he knew the truth. And right now, as vulnerable as he was feeling, it had to be twice as difficult.

He's trying to get his brother off his back so he can hold him properly.

"Gilbert, she needs to draw blood to find out what is wrong. Calm down," he's trying to use his gentlest command voice possible, hoping the sound of his voice will penetrate through the panic. At least his brother wasn't heavy.