Health interfering exercise.....still losing. how come??

I am down with cold and flu since monday evening and have not been able to put in any exercise, not even walking. Altho i did manage to keep my diet almost in the range ( went over by 52 yesterday) . however, have lost 2 pounds in the past 2 days. i am surprised...but apprehensive. Shud i be happy about this loss or will it creep back when i am up and about. can anyone explain this loss to me??? Also, energywise, i feel totally drained out....if not for my kids, i wud stay in bed and do nothing. i am practically dragging myself around. why???