Unable to find my Mac OS operating system in /dev/disk0
According to your screenshot, it looks like you deleted your main OS X partition and the recovery partition. You may very well have destroyed your data.

There is a glimmer of hope though. The numbers don't add up. It's a 250GB drive but the Windows partition is only 70GB. There's ~180GB of space unaccounted for, which might be the partitions you deleted. It's tough to say without knowing the exact steps you took.

You can try to use a partition recovery program like TestDisk to get them back.

I could tell you more of you post a screenshot of the output of the following command:

sudo gpt show /dev/disk0