User Activity

I have over 650 items listed. Suddenly my sales dropped right off. when I try to look up my listing I cannot find them. Why??? They are showing as active. Am I doing something wrong???
went from top seller to bellow. When can I get my top seller status back please
Hi can you tell me how I can get all my sales information since this account was started in 2005??
where is the link for the overseas ebay sites 
Every time I list something, there is someone watching what I list....can I block this person or find out who it is??