What's the difference??

I'm having a hard time knowing the actual difference in whether I really am confused or is it just being overwhelmed. Anytime I get new information bright to my attention or even something simple happening that's new and not in my usual routine I get to where I feel off or a bit dumb because I can't quite understand things anymore. I said for the longest that I get confused but I know what everything is I know who people are and why things are happening. I just find my self not understanding what's happening.I was completely thrown through a loop this week. My entire routine is off every other day I'm not sleeping or in doing to much. Everyday something new has happened out of my routine and I know why it's happening, I know where I'm at, who I'm with I just almost don't understand. I find myself feeling completely lost mentally where before I just felt in a daze now I'm in a daze and lost. Is there a difference between being overwhelmed and confused?? Is there a specific reason I feel more frustrated and in a sense feel dumb about what's happening around me. I met my family members new baby and even that had me lost. I held the baby and just looked in disbelief like I knew they were having a baby but to see the baby was very strange to me like it didn't make sense. Could something more serious be wrong or is this a state of being overwhelmed?