Internal hard drive "fixed" itself after format?

A few days ago my OS (Win 8.1) started to slow down, mainly caused by HDD to stop working. For the first times after restarting windows it started to work fine until the next freeze. It was a good warning for me to back up everything and as I feared, windows logon screen started to act really slow and windows booted in 30 minutes. Then finally the next day it got stuck after I entered my windows password everytime I tried. However I was able to copy and see my files from my Android phone by driverdroid (using Slitaz distro) without any problem.

Well, I format my hard drive, now setup up everything and been using it for the past few hours, no problem exists. It used to freeze on chkdsk before but now no problem in that phase as well.

My question is: Should I be worried still about the hard drive and get a new one ASAP or it is somehow "fixed"?