Been changed from metafomin to Gliclazide. I've only been on it for 2 weeks but it's making me feel ill. I'm really tired, getting horrendous headaches like a tight band around my head, I'm nauseous and having stomach problems. It doesn't appear to be doing anything with my levels either. My morning bloods are between 9 and 10, they don't dip below this even after taking the Gliclazide slowly rising to about 12 by evening. This was about the same on metafomin but I tolerated this better, was slightly nauseous but that was all. What shall I do? Shall I stick it out a little longer or contact my GP?