My suggestion is to hold down the power button for a full 30 seconds. Time it. That should cause it to reboot, which may save the situation. I hope it does.
You didn't mention whether you did a safe disconnect (aka eject) or not before removing it. If you didn't, that's pretty important and could be what happened. Most removable devices these days aren't buffered but if it's still writing to it when you pull the plug that can corrupt it's storage. If that's what you did and it does recover by forcing a reboot you might be wise to then reset it to factory defaults.
It's a really good idea to get used to never pulling the plug until Windows tells you you can. You can do that and get away with it 99% of the time but that other 1% can really get you.
Barry
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