Hey Ian,
I know it can be terrifying to eat some things, like pizza or a cookie, but sometimes we have to do it anyway. Don't force yourself to eat anything. Recovery from anorexia is a very long, difficult path, it takes a lot of baby steps, and even going backwards sometimes, to get better. I wish I could say it was normal to fear food, or fat containing food, but I can't. It is common though.
If you want to start eating other things again, like that pizza, then you need to take it a bite at a time, and start small. Start with trying a few chips, or a cookie, introduce these foods a little at a time. You could also try talking yourself that it's okay to eat it. I have to do that, like if I really want a cookie, it's hard to take that first bite, but if I tell myself that it will be okay if I eat that cookie, and that cookie will not make me fat, then I can take a bite. Usually the first bite is the hardest, but once you try it, and start adding sugar and fat back to your diet, then it should get a bit easier. Remember that sugar and fat are good for us, in portions.
If you need anything, or want to talk, feel free to
pm me.