I have vitamin d, calcium deficiency and require b12 injections, is it safe to not eat meat in my diet?

Yes: Yes, it is safe for you to not eat meat, in fact research shows vegetarians are healthier; diabetics may benefit from avoiding meat more than most people. There is evidence a raw food vegan diet might be especially beneficial for diabetics- see http://www.Naturalnews.Com/028341_diabetes_living_foods.Html & https://www.Youtube.Com/watch?V=-o6gh6qbpfw take 5-8000 iu of vit d3/day, ideally with k.