What Causes Headache And Imbalance Problem After Taking Pantomed 20mg?

Dear Dr, I am suspected for an acid reflux problem and taking panthomed 20 mg as prescribed my family doctor. In addition, I drink Riopan before sleeping. I have also stared a regular physical exercise. Although the feeling around my chest has somehow reduced, I have got forehead ache that makes me wake up in the middle of my sleep. Moreover, I have a feeling of irritation. Whenever I am involved in an activity, I find myself easily irritated and feeling of imbalance. this is actually what bothers me as I am a student and I am not able to read because the pain aggravates whenever I concentrate. What do you advice me