a question about being bipolar and staying in Istanbul

Dear Doctor Husamettin Guldogan, I have bipolar disorder and I have been taking Lithium for about 10 years. I am immigrating to Istanbul from Iran to teach English there. I am bringing my Lithium for a month with my prescription and the letter from my doctor here. I know that for buying the rest of my Lithium from pharmacies in Istanbul, I have to take the prescription from local doctors there but I am so much worried if the doctors there do not prescribe Lithium for me. I have had similar experience when I was in Finland for my MSc. The doctors there told me Lithium might be strong for me and that caused A LOT of problems for me and I had to cancel my university and return to my country. Now I must travel but have no idea what happens to my condition of being bipolar and needing Lithium which has worked for me so good in all these years. I know that maybe I must ask others but I could not find the right person to ask. I appreciate it if you reply my message. Is it probable that the doctors in Istanbul do not prescribe me my medication Lithium?