There is a major eBay server issue affecting many, you are not alone. This could be impacting you ability to view your items.
eBay are aware, and working on this, but it is intermittent, so perhaps try a little later on today, or even tomorrow.
However, if it's the app that you're using, some peeps have found uninstalling and reinstalling the app , the account is then accessible.
@betdav0