Our vet told us once that cats have no sense of time, although how he knows that I'm not sure!
I have read that you can't be out for more than 6 months, they don't seem to take too much notice of the book when we come in and out, but having said that, if they work it out retrospectively you could have problems/ fines etc
If it was me I would be up front at the passport control, show them the date and ask 'visa lazım mı? ( pronounced lazoom murr )
And worst case scenario it costs you 20 quid, but you'll be legally back in your beloved Turkey.
Good luck, hope you continue to get better and enjoy being back, cats are fickle, give it some tuna and it will love you again.
X