I have been put on metformin for about a month now 1500mg a day and usually when I take it I get Nausea making me not really wanting to eat well a couple days ago I went to the chemist to get a new box of the met... And they gave me a non-generic brand (apo-metformin) is this the same ? Will it still do what it's supposed to? Cause since I have had this brand I don't feel any nausea now