Turkey is not longhaul so shouldn't really be a problem. I use a frio bag to keep my insulin in. You can get these on Amazon, they keep your meds chilled. Take spare everything if poss, plenty of strips etc. Apart from that, just test regularly and enjoy your trip.
Cabin crew will be able to give you exact carb content of inflight meal if you ask them. I've found cheapest insurance is taking a bundled package linked to my bank account. Have a fab hol