Anyone on Mirtazapine and find that they often have low blood sugar levels? I'm not diabetic, but I quite often get what seems to be low blood sugar levels. I get really cold, shaky, fast heartbeat and extra anxiety. It's okay about 30mins after I have a juice drink. I eat sensibly.. every 2 hours. I've had a panic attack before because of this.. scared that I was going to faint.