Excessive worrying, whats wrong with me?

I cant stop thinking about death. Not suicidal or anything i mean in ways i can die or my son. LIke plane crashes, earth quakes, tsunamis, car accidentals etc. I am not sure if working at my field is catching up to me (i work in the EMS field) I am constantly surrounded by death but i notice it has gotten worst past 2 months since i planned a trip to TX (leaving this week) without my son for 5 days this is 1st time in his 4 yr life ill be with out him. I don't know i feel like im freaking out. Im worried im going to have an anxiety attack anytime soon or worst while on the plane. What is wrong with me?