Hi Simon,
Sorry to hear you've been unwell, you deserve a sunshine break!!
We have just returned from Calis, we ate out every night & fresh bread etc for lunches every day too. Cocktails most nights on top of a few efes, we didn't scrimp and save and even with souvenirs and a silver ring & T shirts for my 15 year old, spent a little under £800. Great value for money, really tasty food and lots of it and the weather is fantastic. My only advise would be to take drinks and your own food to Dalaman on the way home as the prices at the airport are unbelievable. Example - 2 slices of pizza and a soft drink 22 lira!! our evening meals were approx 60 lira for 3 of us including drinks, just to give you a comparison. Have a fantastic time.