I've lost more than $ 3k just to lose my private key. I saved it in a spreadsheet and did not seem to affect it. But when I used it, my private key was no longer the same, it was changed by the small impact. So this is a lesson learned for us. Be careful in using wallets.
Do you still have that spreadsheet file? Maybe if the spreadsheet program did not change the private key too much you can figure out how to undo the changes. Try pasting some other bitcoin private keys into the same spreadsheet program, and then observe how they get changed. They might not get modified after just pasting, so if not, save and reload the spreadsheet file.
I doubt a spreadsheet program would make random changes to the private key. There is likely to be a "system" to the changes, which you can figure out and then reverse in order to recover your bitcoins. If the "system" can lose information, you might be able to figure out a set of possibilities that is not too large to just try them all. As an example, if the spreadsheet program turns all upper case letters into lowercase ones, and your private key as shown in the spreadsheet now is "aa" then you have to try the four possible originals "AA", "Aa", "aA" and "aa".
Hopefully you can get your bitcoins back.
Good luck!