What should I do about hacked yahoo email?

I received a call from a friend of mine asking about the email she received last night from me. The email told her to checkout a website about a cheap iphone. The website was www.pbat8.com. The email was sent at 3:48 am. I was asleep at this time. My friend forwarded the email to me. It did have my name and my... show more I received a call from a friend of mine asking about the email she received last night from me. The email told her to checkout a website about a cheap iphone. The website was www.pbat8.com. The email was sent at 3:48 am. I was asleep at this time. My friend forwarded the email to me. It did have my name and my email address. I did not send this email. I googled email hacking and came across an article about people hacking emails and deleting your contact list. I checked my contact list and sure enuff it was gone. What can I do about this? Any suggestions would be very helpful. Thanks.
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