Your hard drive is definitely failing. Your read and write speeds are practically zero. Your filesystem test failed to complete. The most important thing to be done at this point is to make sure you have a good backup. Unfortunately, EtreCheck needs Full Drive Access to check the status of your Time Machine backup. If you don’t already have a Time Machine backup, you need to make one. Do this now.
I don’t know if you can take your machine to an Apple store or not. Apple may consider it too old to repair. You should be able to find an Authorized Apple Service Provider, or even an independent repair shop, that will replace your hard drive with an SSD. This is a very easy repair for this machine. It shouldn’t take any longer than 15 minutes. Make sure to get your hard drive cable replaced as well. And as long as you are opening up the machine, may as well upgrade the RAM too.
You should probably also consider a new machine. Older machines are subject to failure in other ways than just the hard drive. You could spend a couple hundred dollars on this machine and see it fail a month later.