Extreme fluctuating blood sugar levels can cause a lot of emotional disturbance like depression, agitation, feeling irritable, anxiety, lack of energy, easy fatigability, and uncontrollable temper. Fluctuating Sugar levels in diabetes can lead to early diabetes complications; even if yours average HbA1c levels look good. It occurs because of explained and unexplained causes, leading to increased sugar levels (Hyperglycemia) and low sugar levels (Hypoglycaemia).