For the past few months, I've been spiking a fever every afternoon. Not high - a degree or so - but my cheeks get really flushed, and sometimes my ears do too. It starts between 2-3 p.m. and lasts until bedtime. And the last month, every night, my feet are like ice cubes. I've had several sinus infections this year, so I've been on antibiotics off and on, but this always comes back. Any thoughts?