Strange problem while booting my mac

I am using a Macbook Air, 8GB RAM, 128GB SSD with High Sierra. Today, when I was working on Excel, my screen suddenly went black. I had to do a hard reboot ( pressing the power button and holding it for 10 sec). But, after that I couldn't login in to my account.

After looking for some solution here and in stackexchange, I booted the system in the single user mode tried fsck. It exited with status code 11. I couldn't get much help on that error. When I tried to mount the root directory, I got this weird error message.

spaceman_free_completed:3701 sfq 1 error removing entry 463579 from free queue: 2

spaceman_freed: freeing 0x712db but 1 bits are already clear. Double free?

This comes numerous times till I switch off the mac and reboot.

I tried SMC Reset, NVRAM reset, complete format(which never worked) and also OS reinstall(which never worked either).

Is there anything I could try before taking my mac to a service center?

Thank you

Sreevathsan Sridhar