If it doesn't even work on the laptop, all you can do is find a data recovery company to try its magic. They might recover all, but it won't be free. And just as well, it's possible they can't do anything or recover only a part of the data.
As we say here: you only lose what you don't backup. It seems you realized that a little bit too late.
I’m having a problem with my SD card. Notifications of “Preparing SD card” and “SD card removed” keep popping up repeatedly (milliseconds apart) and all my data has disappeared. I have a Samsung Galaxy A3 and a 32GB Samsung Evo+ Micro SDHC Class 10 memory card, which I’ve had for about 2 years now. No physical damage to the SD card, looks brand new as I haven’t touched it since putting it into my phone. I’ve turned my phone off and on, rebooted it, restarted it, dusted the card, inserted it into a different phone but the same thing happens. I’ve also tried connecting my phone to a laptop to view folders on the card but it only picks up the phone’s internal memory, if I try to connect the card directly to the laptop with an adapter I get an error saying “Please insert disk into a Secure Digital storage device”. I’m not the most tech savvy person so I have no idea how to access the card at this point. Almost every forum I’ve searched says to format the card, but I couldn’t care less about the card itself. I have 10 years’ worth of files on it that I need to get access to. I just want to copy the info elsewhere and scrap this card. Lord knows I’m gonna make 50 copies of everything after this. Any help to access the info on the card would be greatly appreciated. Thanks.