Blood sugar 228 1.5 hrs after eating, been close to 3 hrs now and now it’s 235. I am dizzy, heart racing, tired. I take metformin 500 mg 2x a day. Should I be worried, my drs won’t change my meds but when I was in hospital they gave me 2 units of insulin for my sugar being 220, so I am wondering if I need insulin now. When should I go to er for sugar? I’ve been extremely thirsty lately and having headaches every day.