Definetly report these symptoms to your doctor immediately!! You may need less of the med then your currently taking. I know it's very similar to Metformin and that stuff is hard to tolerate. Don't be afraid to phone your doctors office and report this first thing. Better to be safe then sorry.
I would tell her as soon as possible and see what you can do to prevent it, or if there is another med that is out there that wont cause that. I don't know if its harmful to baby, but it doesn't sound good for either of you!! Twice would be enough for me to consider consistent.