What really frightens you?

Ive been given some freaky new tablets by my local doctor and it appears that one of the many side effects are nightmares ,to which ive been a victim for three weeks now, cold sweats ,vivid dreams,the works.
It has made me think about what really frightens me so i can address the fear and hope fully give Mrs lav a good nights sleep.

Sharks? as a yorkshireman who rarely goes deeper than his knee?
heights? I’m never going to be a steeple jack?
Really loosing my temper in public?cannot guarantee this one!
just to name a few….
WHAT REALLY SCARES YOU??????