Something very wrong with my macbook
Based on your other question (which you seem to have posted from a different account) and the circumstances surrounding this one, I feel your hard drive is at very high risk of failure.

I would immediately make a full backup of your hard drive.

Once you've made the backup you should satisfy yourself that all of your most important files have been successfully backed up.

Then, as a minimum, I would do a full reformat of your internal hard drive. However, when you do so, don't pick the easy option. Instead click on Security Options and use the slider to choose how many times you want to write over the hard drive. No need to pick anything too high, just enough so it's not formatted in only seconds but instead writes over the entire hard drive.

I suspect that following this process will fail and you won't be able to securely erase the drive. If that's the case, it's time for you to replace the internal hard drive. This is not too difficult (I'd say about medium difficulty) and you can even choose to upgrade to a SSD if you want. 

If, on the other hand, you can successfully securely erase the hard drive, then proceed to re-install your system from scratch. Afterwards you can restore your data from the backup you made (however, do not delete your backup).

Let us know how you go.