I am feeling tightness of left temple, eye, and neck muscle, dizzy when hungry (before I eat).  Now a days feeling mild headache, heavy eyes after eating rice, idli etc. and feeling dull upto 2 hours. I mean before eating and after eating I feel cloudy and unable to concentrate on anything. My blood sugar in the fasting 5.1mM, after eating 7.5mM, and after 3 hours 4.1mM. Is it only a sugar level issue or any other test need to be done? Please suggest. I visited many doctors but it was not clear. For muscle tightness and cloudy, headaches - please suggest