Nausea and vomiting are side effects of METFORMIN.
your ESR is marginally high and is not suggestive of lactic acidosis
It is better if you take METFORMIN in divided doses rather than a single dose.
Lactic acidosis is a very rare complication of METFORMIN and generally tajes place in those people who take excessive alcohol or who are forbidden to take METFORMIN like in patients suffering from hepatic and renal insufficiency
.It is also contraindicated in patients of cardiac failure,bronchial asthma
and chronic bronchitis.
A patient of lactic acidosis has deep rapid breathing,dyspnoea,upper abdominal discomfort
,drowsiness,unexpected deterioration of health etc.