Dropped my external harddrive, what to do?!

Hi all,

I have had a slight accident with my hard drive. I was simply sorting out my room where it fell off my shelf 30cm onto my wooden desk. It was running at the time and Im worried i have lost everything. However when i plugged it back in, i saw all my data. I thought i best back it up onto my WD passport but when i plugged it in again it did not detect. i have a macbook pro so if you suggest any programmes on windows i cannot use it. please help me as i have a lot of photos from the past 3 months not backed up and they mean a lot to me.

Katrina