Do you still have access to the old email?
If so, have you tried adding your old email address to your new paypal account?
EDIT- You can have multiple email addresses in your paypal account.
Also,
Have you linked your new paypal account to ebay?
"Change the PayPal account you use on eBay
To change the PayPal account you use on eBay, go to your Account - opens in new window or tab in My eBay, find the PayPal account information section and follow the links to be taken to PayPal to update your information."
https://www.ebay.com/help/selling/fees-credits-invoices/updating-billing-settings?id=4129
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