I can't watch youtube videos, and when I try my computer makes awful glitch sounds. Is there a way to fix this myself without bringing my macbook in?

I have had my macbook for about half a year. I love anything anime and comic book related except a lot of those websites are unsafe and you get redirected and forced to click "Okay". Youtube was working just fine, until I went to one of those plagued websites and now youtube is a slow and glitchy mess, I can no longer watch videos. I can't click play, and my mac makes awful noises as it tries to play the videos. I have already restarted, updated flash player, and I even updated the software of my laptop, but to no avail.

Setup two new accounts. One as Guest where whatever you do is "lost" (not saved) when you log out. Setup another as "Standard" user. You do not want to be using your computer as Administer account except when doing OS updates or the like.
You should / could / would have been wise to clone your system "back when everything was fine" - usually right after setting up with the OS and Apple's updates.
You upgraded to Yosemite. Consider redownloading Yosemite and saving and create a flash install.
Also backup all your media files - though malware can live inside media files depending on how and where obtained.
Adware is only one part of the puzzle.

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