Thank you for replying. I contacted my host, they said WordPress multi-site has nothing to do with them, and doesn't show up on my host subdomain area, so they couldn't help.
I was able to get the site back. I got my host to restore my backup file from 2weeks ago. Everything was back to normal, I lost a few articles but I have draft somewhere.
The problem I faced definitely has to do with theme support. I created a subdomain with my host, about.example.com and bought a html theme, gave my cpanel login to theme support to install. Something they did most have had a negative reaction to my WordPress multi-site.
I found WordPress multi-site great because I could easily navigate from one to the other, however it has its cons. The fact that I couldn't get any immediate support from WordPress apart from the forum worried me. I am now exporting/recreating the subdomain I had on WordPress multi-site with my host (for support reasons). Also another problem I experienced were the plugin clashes, plugins from a theme used on one site clashed with the plugins from the other site; I did figured a way around this. But my website going offline prompted me to keep each separate and avoid future complicationd.
Both websites have the same menue so it's easy for my users to move between both sites; so subdomain with my host will have to do. Not going to fine it fun to log in and out of each site to update.
Hope the above experience will help someone else.
Thank you again max for responding, I don't always get a responds so I appreciate.