i met this guy when they kept me at the hospital... i do know his name and probbaly last name but how can i?

[Helen]

You've left it a little late to try and find him.
If you know his first and last name, you can try searching him on Google, or social networking sites like Facebook. Of course, if it's a relatively common name, you might not have much luck.
Alternatively, you could go back to the hospital and ask around, but be warned that the staff might not be able to help you on account of patient confidentiality.