What Causes Bug Buzzing Feeling In Ears?

Last week as I was falling asleep I heard/felt a bug buzzing in my ear. I woke up in a panic. As soon as I was alert I could find no signs of a bug in my room. This exact experience has repeated itself several times since. After the 2nd time it happened I thought this was a dream sort of thing. Kind of like how sometimes when your drifting off you'll dream you're falling and start to a wake. Well last night I was watching tv sitting up in bed when the dang bug yet again attacked my ear. But I was awake. Yet I still am unable to find the bug in my room. I'm starting to think there may be a medical reason for this. I recently had gastric bypass and am wondering if I could possibly be experiencing some sort of mental disturbance do to the lack of vitamins? I take all my supplements regualarly. Help!! I'm getting paranoid and afraid to sleep, I don't want a bug laying eggs in my ear or something.