Command button always pressed/activated

Hello,
I got a problem with my main username.
I don't know what happened, but it seems that I did a key sequence with the result that my command/apple key is always pressed/activated.
It's just on my main username so that it won't be a hardware fault.
I need your help guys :-)
Thanks a lot.

A few more informations
My macbook felt a few times on the floor, once on the corner where the power button is located (...), but it was a few months, or a few years ago, and it didn't show the power button's problem before today
Since a few weeks, my trackpad stopped clicking
My battery says since a year or more "service battery", so it could may be battery-related ?
....Yeah, this Macbook is kind of screwed, but I'd like to keep it alive

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