Certainly, I have had these feelings before.
As human beings we question a lot of stuff. Drugs and alcohol do not help the rumblings inside our souls and head. They tend to make things worse.
Even though there is so much out there that we cannot understand or even begin to understand, we cannot get caught up in it. Not much will come it as we go back and forth time and again.
"It's not yesterday .... anymore." --Talking Heads 77