@SarahGen-- If your diabetes is active, meaning if you experience all the side effects of the condition, then yes, your body is not in homeostasis. But your body can return closer to homeostasis with treatment. You have to keep your blood sugar under control and balanced.
Sometimes, it's possible for an individual to have a chronic illness and still be in homeostasis. This is especially true if the illness is not yet active.
Don't be discouraged about your situation. Think of it this way, all of our bodies are constantly trying to adapt to different circumstances. Our body keeps going off balance and then it tries to re-balance itself. This is true even when there isn't a disease.
When we exercise and become hot, our homeostasis goes off balance. It tries to return our temperature back to normal by sweating. This is just one example of the numerous issues our bodies deal with every day.