Terror Moments

I keep having, recently, what I can only describe as "terror moments". It's moments where I start thinking about the Big Questions and I get stuck, sort of wrapped in this big blanket of fear. I don't know if anyone else gets these. I can be in a perfectly acceptable mood and getting on with things, then all of a sudden the thought pops into my head:

Is there life after death?
Do I just stop existing?
What made me?
What will happen when I'm just...not here.

And so on, with similar questions. It's kind of hard to write this out because talking about it is making me have one of those moments now. But I really want to get over these and I think there will come a point where I just have to face them, even if that isn't already.

I don't know if I can manage to carry on articulating this even. Maybe I will come back to it. Not losing this progress though so will post half a post. But my pulse has picked up and I've got that horrible knot of panic in my chest so I'm going to stop now.

I hope someone somewhere understands what I'm talking about.