Ok, so, I just got my Mac back after 5 months in the repair shop. I went to install winblows 7 via Boot Camp Assistant, but was having issues. I went into diskpart, and not remembering how to use it, accidently formatted the OS X drive. Not knowing what I had just done, I went and cleaned it. It wasn't until a few formats and conversions later that I realized I had obliterated every last one of my files and critical system stuff, including my recovery drive, because I had selected the wrong volume to change.
I have no doubt there is no way to get my files back, but I at least want OS X back. I have no access to any other Mac anywhere, and I can't afford to pay for support or a new image, and somehow every last Time Machine backup is corrupt.
What can or should I do?
EDIT: As per request, I ran
create in diskpart. The external drive was not empty, but is now :/
MacBook Pro, Model A1502, Mfd. late 2014, 11" model, 128GB Internal SSD, 1TB external HDD, x64 Architecture