Hello ma'am and welcome.Metformin
certainly helps in controlling PCOS
and regularizing your menstrual cycle, but it also has an effect on blood sugar levels and so I would not advise high doses of the same.
Reason being, that if you consume high doses, your blood sugar levels can drop and result in making your body more susceptible to infections and so increasing the chances of infections.
As for the white clumps, I would advise you to continue with 2 and notice if these clumps recur, if they do then it would be best to report them to your doctor.
Hope this helps.