If you are using the eBay app, try using a desktop browser to view your Purchase History. I have seen indications that the eBay app has difficulty displaying purchases of users with many transactions in a very short period of time.
If you are already using a desktop browser, in some cases refreshing the page can help if you are getting an error. Or holding down the shift key and refreshing the page to bypass the browser cache. Or try a different browser entirely.
If the problem is with your Purchase History page not loading correctly, you should also be able to see your purchases on your Summary page.
If that does not work for you, you can try signing in to another site such as ebay.ca or ebay.com.au to view your purchases, though your transactions will be displayed in Canadian or Australian dollars, respectively.
