Hello ,
"and lo, I am with you always, even to the end of the age.” Amen."
Matthew 28:20
"Even on the days when I can't feel His nearness?"
Yes!
"What about the days when everything seems to be going wrong?"
He's still there.
"Is He still there when my entire world seems to be falling apart?"
The Bible says that He is.
"For I say, through the grace given to me, to everyone who is among you, not to think of himself more highly than he ought to think, but to think soberly, as God has dealt to each one a measure of faith." Romans 12:3
Each of us has been given a little measure of faith.
Exercising that faith (no matter how small), isn't foolishness.
Have a great day and God bless!