Fear

I went to bed with a clear head last night, but as I lay comfortably in my bed a terrifying thought flooded my brain and I could not get to sleep for a while. It is not the first time I have ever thought this exact thing, and every-time it plays out in my head I am left anxiety ridden and afraid.
I was thinking about what would happen if an intruder entered my house while I was alone at home with my three children. What would I do? What could I do? My first thought was to immediately round up my children and flee to my bedroom, lock the door and then go into my closet and lock that door, but what would I do from there? Do I attempt to face the attackers on my own and lock the kids safely in my closet? Maybe I should stay in the closet and try to keep the kids calm. I have no weapon in there so now it might be smart to place our shotgun in the closet just in case this terrifying possibility should come to fruition. If I stay outside the closet, perhaps they would only hurt me and flee sparing the lives of my children. If I hid in the closet with them then they were at just as great a risk if they found us. We also have a crawl space below our house that just so happens to have an entrance within that very closet. Should I get myself and my kids into the crawl space before they can find us? If they do find us, there is no way out. We would surely be caught. My next concern is that even if I could thwart the attackers, could I keep my children quiet enough to keep us from being found? How would I protect my children? Would it really come down to placing a shotgun in my closet and seeking refuge there until they got into the closet and then shoot the attacker? Or will I need to lay my life on the line in HOPES that my children would remain unharmed? This is all so very scary and what does one do to prepare? How should we behave in the event this terribly frightening thought should become a reality?
This only brought up further questions like how would I protect my family if there was a fire? What if something happens at home that renders me unconscious, would my kids know what to do? I wonder if all of this stems from an unconscious feeling of inadequacy as a mother. Or perhaps it's the fear that I cannot control or prepare for everything that might get thrown our way. Does anyone else ever experience this?