Hello Doctor..I Had No Periods For 3 Months..I Also Had

hello doctor..I had no periods for 3 months..I also had pcos ..so doctor suggested me to take glucophage for 2 months and progyluton for 21 days. on my 3rd day of progyluton I had my periods and it lasted for 3-4 days...
my blood sugar was normal ...
am feeling very much irritated and muscle pain , sleepy ,weakness after i startd glucophage(today is 13th day of having glucophage)
should i stop taking glucophage after 21 days(along with progyluton) or continue till 60 days ?pls suggest