Went to a medical centre today and had an examination. Had the bruises and cuts documented and they gave me a record of the exam and results.
Said I can take it along if I want to make a denuncia.

Trying to track down a couple of witnesses now but some of them were a bit worse for wear so not sure how reliable they will be.
I have the bar owner and his missus though. His missus saw him fighting two other people before he tried fighting me.

Police weren´t looking for either of them though (they are both Spanish locals) so as long as I have a witness to those fights then I would guess it could be difficult for him to pin his injuries on the blows I landed?
He already had a bruise on his eye and could have had blood on his face (I think I saw some...

He doesnt really seem the type to have gone to the police (and it would seem stupid after picking the fight and losing) so I am guessing maybe his wife did when she saw the state of him but she wasn´t there when it occurred. Still trying to find out who has made what report to who!

Stressing me out! Policecar went past today and my heart skipped a beat!

Sorry but you have only said that the bar owner told you that the police said they wanted to talk to you.
There has been no mention of an official denuncia this is merely speculation on your part.
I think it was a good idea to get the medical info just in case but I think you either need to do as has been said before, lie low and hope it all blows over or go into the police and find out why they want to talk to you.