Dreams are fantasies. Not really giving any insight on things, however sometimes let you experience something from totally different angle. But it is YOU who decide if you want seek explanation for them.
I remember one dream.
A group of people landed on the island. Their goal: reach the LAVA regulator inside the volcano, getting clues for the release mechanism codes along the way with various challenges. Sometimes the pressure realease was successful, sometimes you ended with eruption.
And that dream is the remmant of the reality show I watched as a kid 'Fort Boyard' if you are familiar with it.

I would like to seek explanation and I never heard of Fort Boyard.

Reminds me of Wolfenstein II the new Colossus

From what I'm seeing, is that there are two things I noticed that is a reference to what you were dreaming about:

-The fear of losing your mother due to hospitalization, so your head being planted onto another body is basically combining your love of living machines with another person's body, basically body surgery and dismembering your body parts onto someone else's body.

-High school and thrift stores based off of real life experience (remembering the best and worst memories of high school and having to leave one of your best friends from high school behind in favor of other friends, not to mention thrift stores being mentioned as more of your curiosity and love of visiting brick and morter/mom and pop shops like Goodwill, Penny Shops, and General/Discount/Dollar stores to name a few).

In reality, Dreams allow you to experience things, places, people, and worlds that either you would be interested in going to visit in real life, or simply be glad you don't end up in some demise, injury, or situation where you could hurt yourself or get into a consequence you didn't like. From my point of view, it's like seeing an alternate reality/different dimension of the different me in another timeline where I did encounter bullies that beat me up, me jumping off of a ShopRite building out of curiosity if I could survive the landing on the asphalt, getting involved in high speed chases with the police or my dad's truck able to stop dead in its tracks at the perfect spot in front of the red traffic light, my Catholic Christian School just so happens to have a dragon school underground and goes nearly 10 levels of sub-floors with most of the classes ranging from elementary to high school, or going through a freakin' dragon war and somehow I was able to meet and defeat Cynder, but was able to take her evil spirit and fuse hers with mine, allowing me to have the ability to shapeshift into her at any time, despite looking like the same human form, but in one of the mirrors I can see Cynder talking to me and my body moving reflects the one in the mirror as the female Cynder dragon form, etc.)

It's basically the best ever fan fiction/movie/tv show REM Sleep experiences you will ever have in your life, except you're the star of every part of that dream. And once you wake up, you feel as if planet earth and reality feels dull, depressing, and boring, and you wish the ones that occur in your dreams (some of them, not all of them) could occur right in front of you or happen in real life.

Believe me, I've had one dream I had 30 years ago, before I was born, and one that I started having around January 2000 (25 years ago).

Bart had his head sewn onto Lisa's body too