I found this study on non diabetics taking Setraline.
http://www.ncbi.nlm.nih.gov/pubmed/22973359
There were no significant differences in physical examination (blood pressure, BMI, body weight, height, waist circumference) and laboratory findings (glucose, HDL-C, LDL-C, HOMA-IR and HbA1C levels) at the 12(th) week after of treatment with sertraline compared to pretreatment values. However, insulin levels at the 4(th), 8(th) and 12(th) weeks significantly increased compared with pretreatment values. Likewise, triglyceride levels at the 8(th) and 12(th) weeks significantly increased compared with pretreatment values.
CONCLUSIONS:
Sertraline-treated patients have to be followed up for blood insulin and triglyceride levels. In addition, their treatment plan needs to be adjusted as necessary to prevent possible metabolic changes.
It could be that the depression has lifted, you are eating better than you did when you were depressed and you need a medication review as you are on other medications that lower blood glucose.
Best to talk it over with your G.P. as Setraline cannot just be stopped and needs to be tapered off. You could ask him to do this and put you on another anti-depressant that is not contra indicated for diabetics. You also need him to order a test for a full lipid profile in case the Setraline has increased your triglycerides.
Hope this helps.
CC.