She's sick

My wife hasn't been feeling well for a long time. She has some certain conditions that run in her family that habe us very concerned for her. She's been putting off making any appointments because she's uninsured, and she didn't want the added financial burden of medical bills. Her sister had bugged her enough about making an appointment that she finally did. She went today and learned that there are some serious things going on, and she really needs to get things checked out further. I'm scared for her, and I think she's scared too. We went to her sister's house tonight to play cards. We had a decent night. except that she ignored me almost all night. We get in the car for the 30 minute drive home and she doesn't say anything the whole trip. When we finally get to the house, she starts venting that I don't care, that everyone cares more than I do, that I don't show it at all, that her sister had to force her to make the doctors appointment and that I didn't care, and that I care about everyone and everything more than I do for her. The truth is that I care deeply and I am so scared for her right now. I don't show my emotions well, but that doesn't mean that I don't care. I know that she's just scared, but I don't know how to respond to her when she's like this. She won't let me touch her, barely talks to me or acknowledges me, won't let me do the things for her that I normally do- things like getting her a drink of water, getting her an extra blanket when she's cold. Like I said, I know that she's scared. I just don't know what to do. She has a bunch of tests coming up and I want to be there for her and help her, but I don't know if she'll let me.