The files will still be there on your hard drive but are likely to be split up into segments. I think it's possible to attempt a retrieval but it would need a real specialist to do it.
If you've not backed up your files, that might be the only way of trying to get at them again. One of the 'techie' members might know a way but.... if there are no pointers to the files , this will be virtually impossible and the longer the time since you have deleted them, the more likely that they will be overwritten by newer info..
Sorry, it really is essential that precious /important files are regularly backed up.
I'll ask a Mod to put this query on the tech board so that the specialists are more likely to see it.
Gadget