The mouse on my Macbook Pro is acting like a maniac, moving around on it's own, and clicking on it's own!

This happened completely out of the blue when I started my computer this morning. At first I just noticed that the touchpad wasn't responding very well. Then the cursor started moving on it's own, and clicking completely randomly at times as well. I have no idea what's going on or what may have happened, as I'm VERY careful with my laptop. Have tried restarting several times, it doesn't do the trick. It's also nearly impossible to try and change any settings or work at all on the computer, as the cursor/mouse is living a life on it's own (typing this from my iphone...).
Help!

UPDATE:
I just solved this by plugging a mouse into the laptop, disabled "tap to click", and then unplugged the mouse again.
The trackpad now works as perfectly as it used to. I also enabled "tap to click" again, and it also works now.

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