I'd recommend a recent and thoughtful New Yorker article on autoimmune diseases. It's not available online for free, however, but your public library probably has this issue available.
Meghan O’Rourke, Personal History, “What’s Wrong With Me?,” The New Yorker, August 26, 2013, p. 32.
Meghan O’Rourke, Personal History, “What’s Wrong With Me?,” The New Yorker, August 26, 2013, p. 32.