Hi, you'll have no problem with your B12 jab, I'm Ceoliac so I needed mine every 3 months. You can buy 5 shots of B12 from the chemist very cheaply and the chemist will administer the jabs for you. I used to go to the one across from Migros / Lemon H2O in Fethiye, he supplied the needles and did the job for no charge, having said that we did buy all of our meds from him. On your other questions - quite a few prescription meds can be bought over the counter in Turkey, as for SGK, no idea but I do know they don't cover any existing conditions, whether this applies to meds for such conditions I don't know. Enjoy planning your new life.