Help! Something is eating my contacts

Hi,

A week ago something started eating my gmail messages. Turns out someone in China has gotten into my gmail account.

Now I just noticed that my contacts are disappearing. As we're gone yesterday. Bs gone this morning.

And I noticed two Chinese characters in my contacts at the bottom of my list. I did not add those.

Should I delete them? Is there anything else I need to do?

Thanks,

Elli