Hello Doctor....I recently moved from Galus/ Met. 50/850 to 50/1000. There has been some lack of energy accompanied by tinnitus and headaches. I started taking this drug about two months ago, starting with Galus/Met 50/500 then tweeked to 50/850 and for the last three weeks, 50/1000 all the while my headaches have increased in intensity and frequency with the higher doses of I presume, Metformin. Incidentally my blood sugar readings have come down over time to something approaching normal from a history of being extremely high. Any enlightenment would be appreciated. Thank you....Christian Wainwright.