Dashboard Disappeared after migrating GoDaddy hosting?

Hello!
I am hoping to get some help, as I am not the most versed in the back-end of websites/blogs.

I have two WordPress websites – courtneyjade.com & Belovelydarling.com

Recently, I had to migrate my GoDaddy hosting to a newer server because they were terminating the old one. I had no idea how to do this, so I asked my friend for help, and he did all of the work.

However, until this morning, when I went to https://www.belovelydarling.com, it would show up as my courtneyjade.com site.

I called GoDaddy, and they were able to direct it back to my belovelydarling.com site, but for some reason the theme wasn’t working and so it’s defaulted to a very basic layout.

Now I can actually log into my admin account for belovelydarling, but when I do, the dashboard is all but gone. I see my posts/content in a column on the right, and a skinnier column on the left just has a link to my website: Belovelydarling.com
Everything has disappeared! I’m at a complete loss for where to start, or how to fix this…. help??