Lyme fog
n.— «The pain was constant. It nagged at her joints and turned her free time into a perpetual nap. What was happening to her brain, however, made life truly unbearable. The Rev. Claire North, 52 had grown accustomed to what long-time Lyme disease sufferers refer to as “Lyme fog.” She’d walk into a room, turn around, and walk out bewildered, unable to remember what she had come into the room for.» —“Living with Lyme” by Matt Tuthill in Sunderland Bennington Barrier (Vermont) May 12, 2006. (source: Double-Tongued Dictionary)