Contact eBay in the morning and let them know that you made a mistake. Listing fees are non-refundable, but if they can see that you made a mistake they may refund you.
I’ve found that the easiest route to contact eBay Customer Services is via the link below where you can request a call back:
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid