Glyburide 2.5 g.

I have gestational diabetes and my doctor wasn't satisfied with my fasting result. Some of them are little over 100. He put me in glyburide  2x a day and told me to avoid all carbs. Both of my after dinner and my fasting dropped to 80 with my first dose and my after breakfast was 52 on my second dose. I felt lightheaded and I sweated a lot. I send him a message and he changed my dose to once a day. Who else have same experience? How did u deal with it?