Hello~I agree with Kirstie, it does sound like an infection. I would see your doctor again and ask if another type of antibiotic would work better. I hope by now, however, that you are feeling better and that this problem has cleared up.
Hi there - "GLB" is not a common term for a test, at least here in the US. Could you be more specific about what the problem is, and what you were tested for, and perhaps spell out what "GLB" stands for?