Yep. I've been through this a LOT. You're asking a lot of unanswerable questions, and naturally anxiety does not respond well to questions that are unanswerable. Instead, we obsess over these things, trying to find a satisfying answer, but there really isn't one. Lots of the great writers, poets, etc. had these kinds of thoughts. Some people refer to it as "existential depression." When my anxiety is at its worst, I often wonder what the point to life, existence, etc. is. Again, there really isn't a good answer. I find the best way to get past this is to find other things to focus on. I think this kind of problem occurs with people (like myself) who spend too much time in their own heads. Do your best to turn your thoughts outward, and you'll probably find some relief.